diff --git a/src/helpers/index.ts b/src/helpers/index.ts
index 5121faa4..0e3277b1 100644
--- a/src/helpers/index.ts
+++ b/src/helpers/index.ts
@@ -2,3 +2,4 @@ export { isLastChar } from './is-last-char';
 export { onlyNumbers } from './only-numbers';
 export { generateChecksum } from './generate-checksum';
 export { generateRandomNumber } from './generate-random-number';
+export { isEven } from './is-even';
diff --git a/src/helpers/is-even/index.ts b/src/helpers/is-even/index.ts
new file mode 100644
index 00000000..5348cafd
--- /dev/null
+++ b/src/helpers/is-even/index.ts
@@ -0,0 +1,3 @@
+export function isEven(number: number): boolean {
+  return number % 2 === 0;
+}
diff --git a/src/utilities/conta-bancaria/__tests__/bancoBanrisul.test.ts b/src/utilities/conta-bancaria/__tests__/bancoBanrisul.test.ts
new file mode 100644
index 00000000..58bdac92
--- /dev/null
+++ b/src/utilities/conta-bancaria/__tests__/bancoBanrisul.test.ts
@@ -0,0 +1,12 @@
+import { BankValidator } from "./bankValidator";
+
+export class BancoBanrisulValidator extends BankValidator{
+
+  protected isValidFormat(bankAccount: string): boolean {
+    return /^\d{8}\-(\d{1}|x)$/.test(bankAccount);
+  }
+
+  protected checkDV(bankAccount: string): boolean {
+    return true;
+  }
+}
diff --git a/src/utilities/conta-bancaria/__tests__/bancoDoBrasil.test.ts b/src/utilities/conta-bancaria/__tests__/bancoDoBrasil.test.ts
new file mode 100644
index 00000000..df60ff87
--- /dev/null
+++ b/src/utilities/conta-bancaria/__tests__/bancoDoBrasil.test.ts
@@ -0,0 +1,20 @@
+import { isValidAccount } from '..';
+
+describe("isValid", ()=>{
+  describe("valid accounts",()=>{
+    it("returns true", ()=>{
+      expect(isValidAccount("001", '00210169-6')).toBe(true);
+      expect(isValidAccount("001", '1171032-2')).toBe(true);
+      expect(isValidAccount("001", '19932-X')).toBe(true);
+      expect(isValidAccount("001", '1050769-8')).toBe(true);
+      expect(isValidAccount("001", '87889-8')).toBe(true);
+    })
+  })
+  describe("wrong format",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("001", '')).toBe(false);
+      expect(isValidAccount("001", '123456789-0')).toBe(false);
+      expect(isValidAccount("001", 'asdfasdf')).toBe(false);
+    })
+  })
+})
diff --git a/src/utilities/conta-bancaria/__tests__/bradesco.test.ts b/src/utilities/conta-bancaria/__tests__/bradesco.test.ts
new file mode 100644
index 00000000..d152b763
--- /dev/null
+++ b/src/utilities/conta-bancaria/__tests__/bradesco.test.ts
@@ -0,0 +1,27 @@
+import { isValidAccount } from '..';
+
+describe("isValid", ()=>{
+  describe("valid accounts",()=>{
+    it("returns true", ()=>{
+      expect(isValidAccount("237", '0238069-2')).toBe(true);
+      expect(isValidAccount("237", '0301357-P')).toBe(true);
+      expect(isValidAccount("237", '0325620-0')).toBe(true);
+      expect(isValidAccount("237", '0284025-1')).toBe(true);
+      expect(isValidAccount("237", '0195470-9')).toBe(true);
+    })
+  })
+  describe("wrong format",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("237", '')).toBe(false);
+      expect(isValidAccount("237", '123456789-0')).toBe(false);
+      expect(isValidAccount("237", 'asdfasdf')).toBe(false);
+    })
+  })
+  describe("invalid account",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("237", '0195470-1')).toBe(false);
+      expect(isValidAccount("237", '0195471-P')).toBe(false);
+      expect(isValidAccount("237", '0195491-0')).toBe(false);
+    })
+  })
+})
diff --git a/src/utilities/conta-bancaria/__tests__/caixaEconomicaFederal.test.ts b/src/utilities/conta-bancaria/__tests__/caixaEconomicaFederal.test.ts
new file mode 100644
index 00000000..ad5361b5
--- /dev/null
+++ b/src/utilities/conta-bancaria/__tests__/caixaEconomicaFederal.test.ts
@@ -0,0 +1,21 @@
+import { isValidAccount } from '..';
+
+describe("isValid", ()=>{
+  describe("valid accounts",()=>{
+    it("returns true", ()=>{
+      expect(isValidAccount("104", '00100000448-6', "2004")).toBe(true);
+    })
+  })
+  describe("invalid accounts",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("104", '00100000448-7', "0189")).toBe(false);
+    })
+  })
+  describe("wrong format",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("104", '', "")).toBe(false);
+      expect(isValidAccount("104", '123456789-0', "")).toBe(false);
+      expect(isValidAccount("104", 'asdfasdf', "")).toBe(false);
+    })
+  })
+})
diff --git a/src/utilities/conta-bancaria/__tests__/citibank.test.ts b/src/utilities/conta-bancaria/__tests__/citibank.test.ts
new file mode 100644
index 00000000..cc123e83
--- /dev/null
+++ b/src/utilities/conta-bancaria/__tests__/citibank.test.ts
@@ -0,0 +1,22 @@
+import { isValidAccount } from '..';
+
+describe("isValid", ()=>{
+  describe("valid accounts",()=>{
+    it("returns true", ()=>{
+      expect(isValidAccount("745", '0007500465-8', "0075")).toBe(true);
+      expect(isValidAccount("745", '1420412612-0', "0013")).toBe(true);
+    })
+  })
+  describe("invalid accounts",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("745", '1420412612-1', "0013")).toBe(false);
+    })
+  })
+  describe("wrong format",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("745", '', "")).toBe(false);
+      expect(isValidAccount("745", '123456789-0', "")).toBe(false);
+      expect(isValidAccount("745", 'asdfasdf', "")).toBe(false);
+    })
+  })
+})
diff --git a/src/utilities/conta-bancaria/__tests__/hsbc.test.ts b/src/utilities/conta-bancaria/__tests__/hsbc.test.ts
new file mode 100644
index 00000000..0b85e8ec
--- /dev/null
+++ b/src/utilities/conta-bancaria/__tests__/hsbc.test.ts
@@ -0,0 +1,21 @@
+import { isValidAccount } from '..';
+
+describe("isValid", ()=>{
+  describe("valid accounts",()=>{
+    it("returns true", ()=>{
+      expect(isValidAccount("399", '853838-6', "0007")).toBe(true);
+    })
+  })
+  describe("invalid accounts",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("399", '853838-5', "0007")).toBe(false);
+    })
+  })
+  describe("wrong format",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("399", '', "")).toBe(false);
+      expect(isValidAccount("399", '123456789-0', "")).toBe(false);
+      expect(isValidAccount("399", 'asdfasdf', "")).toBe(false);
+    })
+  })
+})
diff --git a/src/utilities/conta-bancaria/__tests__/itau.test.ts b/src/utilities/conta-bancaria/__tests__/itau.test.ts
new file mode 100644
index 00000000..6aadb806
--- /dev/null
+++ b/src/utilities/conta-bancaria/__tests__/itau.test.ts
@@ -0,0 +1,23 @@
+import { isValidAccount } from '..';
+
+describe("isValid", ()=>{
+  describe("valid accounts",()=>{
+    it("returns true", ()=>{
+      expect(isValidAccount("341", '02366-1', "2545")).toBe(true);
+      expect(isValidAccount("341", '98197-0', "0031")).toBe(true);
+      expect(isValidAccount("341", '11745-6', "4102")).toBe(true);
+    })
+  })
+  describe("invalid accounts",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("341", '11745-6', "0031")).toBe(false);
+    })
+  })
+  describe("wrong format",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("341", '', "")).toBe(false);
+      expect(isValidAccount("341", '123456789-0', "")).toBe(false);
+      expect(isValidAccount("341", 'asdfasdf', "")).toBe(false);
+    })
+  })
+})
diff --git a/src/utilities/conta-bancaria/__tests__/real.test.ts b/src/utilities/conta-bancaria/__tests__/real.test.ts
new file mode 100644
index 00000000..d7d07e97
--- /dev/null
+++ b/src/utilities/conta-bancaria/__tests__/real.test.ts
@@ -0,0 +1,21 @@
+import { isValidAccount } from '..';
+
+describe("isValid", ()=>{
+  describe("valid accounts",()=>{
+    it("returns true", ()=>{
+      expect(isValidAccount("356", '5711460-9', "1835")).toBe(true);
+    })
+  })
+  describe("invalid accounts",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("356", '5711460-0', "1835")).toBe(false);
+    })
+  })
+  describe("wrong format",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("356", '', "")).toBe(false);
+      expect(isValidAccount("356", '123456789-0', "")).toBe(false);
+      expect(isValidAccount("356", 'asdfasdf', "")).toBe(false);
+    })
+  })
+})
diff --git a/src/utilities/conta-bancaria/__tests__/santander.test.ts b/src/utilities/conta-bancaria/__tests__/santander.test.ts
new file mode 100644
index 00000000..04614689
--- /dev/null
+++ b/src/utilities/conta-bancaria/__tests__/santander.test.ts
@@ -0,0 +1,21 @@
+import { isValidAccount } from '..';
+
+describe("isValid", ()=>{
+  describe("valid accounts",()=>{
+    it("returns true", ()=>{
+      expect(isValidAccount("033", '01017417-9', "0189")).toBe(true);
+    })
+  })
+  describe("invalid accounts",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("033", '01017417-1', "0189")).toBe(false);
+    })
+  })
+  describe("wrong format",()=>{
+    it("returns false", ()=>{
+      expect(isValidAccount("001", '', "")).toBe(false);
+      expect(isValidAccount("001", '123456789-0', "")).toBe(false);
+      expect(isValidAccount("001", 'asdfasdf', "")).toBe(false);
+    })
+  })
+})
diff --git a/src/utilities/conta-bancaria/index.ts b/src/utilities/conta-bancaria/index.ts
new file mode 100644
index 00000000..e74e5f62
--- /dev/null
+++ b/src/utilities/conta-bancaria/index.ts
@@ -0,0 +1,33 @@
+import { CitibankValidator } from './validators/citibank';
+import { HSBCValidator } from './validators/hsbc';
+import { RealValidator } from './validators/real';
+import { ItauValidator } from './validators/itau';
+import { BradescoValidator } from './validators/bradesco';
+import { CaixaEconomicaFederalValidator } from './validators/caixaEconomicaFederal';
+import { SantanderValidator } from './validators/santander';
+import { BancoDoBrasilValidator } from './validators/bancoDoBrasil';
+
+type BankCode = "001" | "033" | "104" | "237" | "341" | "356" | "399" | "745";
+
+const BANKS = {
+  "001": BancoDoBrasilValidator,
+  "033": SantanderValidator,
+  "104": CaixaEconomicaFederalValidator,
+  "237": BradescoValidator,
+  "341": ItauValidator,
+  "356": RealValidator,
+  "399": HSBCValidator,
+  "745": CitibankValidator
+}
+
+/**
+ *
+ * @param bankCode 001: Banco do Brasil, 033: Santander, 104: CEF, 237: Bradesco, 341: Itau, 356: Real, 399: HSBC, 745: Citibank
+ * @param accountNumber
+ * @param agencyNumber Banks 003, 104, 237, 341, 356, 399 and 745 requires agencyNumber
+ * @returns
+ */
+export function isValidAccount(bankCode:BankCode, accountNumber: string, agencyNumber?: string) {
+  const bank = new BANKS[bankCode]();
+  return bank.isValid(accountNumber, agencyNumber);
+}
diff --git a/src/utilities/conta-bancaria/validators/bancoDoBrasil.ts b/src/utilities/conta-bancaria/validators/bancoDoBrasil.ts
new file mode 100644
index 00000000..93bd5ae7
--- /dev/null
+++ b/src/utilities/conta-bancaria/validators/bancoDoBrasil.ts
@@ -0,0 +1,31 @@
+import { BankValidator } from "./bankValidator";
+
+export class BancoDoBrasilValidator extends BankValidator{
+
+  protected isValidFormat(bankAccount: string): boolean {
+     return /^\d{1,8}(\-(\d{1}|X))?$/.test(bankAccount);
+  }
+
+  protected checkDV(bankAccount: string): boolean {
+    const bankAccountSplited = bankAccount.split("-");
+    const account = bankAccountSplited[0].length < 8 ? this.formatLeftZeros(8 - bankAccountSplited[0].length, bankAccountSplited[0]) : bankAccountSplited[0];
+    const verificationDigit = bankAccountSplited[1] || 'X'
+    return this.getAccountVerificationDigit(account) === verificationDigit;
+  }
+
+  private formatLeftZeros(count:number, initialValue:string):string{
+    if(count) {
+      return this.formatLeftZeros(count-1, `0${initialValue}`)
+    }
+    return initialValue;
+  }
+
+  private getAccountVerificationDigit(accountNumber:string){
+    const digitSum = accountNumber.split("").map(Number).reduce((acc,cur,index)=> acc + cur * (9-index),0);
+    const dv = (11 - digitSum%11);
+    if(dv === 10) return "X";
+    if(dv === 11) return "0";
+    return  dv.toString()
+  }
+
+}
diff --git a/src/utilities/conta-bancaria/validators/bankValidator.ts b/src/utilities/conta-bancaria/validators/bankValidator.ts
new file mode 100644
index 00000000..3e0187c9
--- /dev/null
+++ b/src/utilities/conta-bancaria/validators/bankValidator.ts
@@ -0,0 +1,9 @@
+export abstract class BankValidator {
+  public isValid(bankAccount: string, bankAgency?: string): boolean {
+    return this.isValidFormat(bankAccount,bankAgency) && this.checkDV(bankAccount, bankAgency);
+  }
+
+  protected abstract isValidFormat(bankAccount: string, bankAgency?: string): boolean;
+
+  protected abstract checkDV(bankAccount: string, bankAgency?: string): boolean;
+}
diff --git a/src/utilities/conta-bancaria/validators/bradesco.ts b/src/utilities/conta-bancaria/validators/bradesco.ts
new file mode 100644
index 00000000..db9f2ad4
--- /dev/null
+++ b/src/utilities/conta-bancaria/validators/bradesco.ts
@@ -0,0 +1,22 @@
+import { BankValidator } from "./bankValidator";
+
+export class BradescoValidator extends BankValidator{
+  protected isValidFormat(bankAccount: string): boolean {
+    return /^\d{7}\-(\d{1}|P)?$/.test(bankAccount);
+ }
+
+ protected checkDV(bankAccount: string): boolean {
+   const bankAccountSplited = bankAccount.split("-");
+   const account = bankAccountSplited[0];
+   const verificationDigit = bankAccountSplited[1];
+   return this.getAccountVerificationDigit(account) === verificationDigit;
+ }
+
+ private getAccountVerificationDigit(accountNumber:string){
+   const digitSum = accountNumber.split("").reverse().map(Number).reduce((acc,cur,index)=> acc + cur * ((index%7+2)),0);
+   const rest = digitSum%11;
+   if(rest === 1) return "P";
+   if(rest === 0) return "0";
+   return  (11 - rest).toString()
+ }
+}
diff --git a/src/utilities/conta-bancaria/validators/caixaEconomicaFederal.ts b/src/utilities/conta-bancaria/validators/caixaEconomicaFederal.ts
new file mode 100644
index 00000000..9aec4515
--- /dev/null
+++ b/src/utilities/conta-bancaria/validators/caixaEconomicaFederal.ts
@@ -0,0 +1,25 @@
+import { BankValidator } from "./bankValidator";
+
+export class CaixaEconomicaFederalValidator extends BankValidator{
+  protected isValidFormat(bankAccount: string, agencyNumber:string): boolean {
+    return /^\d{11}\-\d{1}$/.test(bankAccount) && /^\d{4}$/.test(agencyNumber);
+ }
+
+  protected checkDV(bankAccount: string,  agencyNumber:string): boolean {
+    const account = bankAccount.split("-")[0];
+    const accountType = account.slice(0,3);
+    const accountNumber = account.slice(-8)
+    const verificationDigit = bankAccount.split("-")[1];
+    return this.getAccountVerificationDigit(accountNumber, agencyNumber, accountType) === verificationDigit;
+  }
+
+  private getAccountVerificationDigit(accountNumber:string, agencyNumber:string, accountType: string){
+    const agencySum = agencyNumber.split("").map(Number).reduce((acc,cur,index)=> acc + cur * (8 - index),0);
+    const accountTypeSum = accountType.split("").map(Number).reduce((acc,cur,index)=> acc + cur * (4 - index),0);
+    const accountNumberSum = accountNumber.split("").map(Number).reduce((acc,cur,index)=> acc + cur * (9 - index),0);
+    const sum = (agencySum + accountNumberSum + accountTypeSum)* 10
+    const mod = Math.trunc(sum/11);
+    const rest = Math.abs(mod * 11 - sum)
+    return  (rest === 10 ? 0: rest).toString();
+  }
+}
diff --git a/src/utilities/conta-bancaria/validators/citibank.ts b/src/utilities/conta-bancaria/validators/citibank.ts
new file mode 100644
index 00000000..09fdc668
--- /dev/null
+++ b/src/utilities/conta-bancaria/validators/citibank.ts
@@ -0,0 +1,20 @@
+import { BankValidator } from "./bankValidator";
+
+export class CitibankValidator extends BankValidator{
+  protected isValidFormat(bankAccount: string, agencyNumber:string): boolean {
+    return /^\d{7}\-\d{1}$/.test(bankAccount) && /^\d{4}$/.test(agencyNumber);
+  }
+
+  protected checkDV(bankAccount: string, bankAgency:string): boolean {
+    const accountNumber = bankAccount.split("-")[0];
+    const verificationDigit = bankAccount.split("-")[1];
+    return this.getAccountVerificationDigit(accountNumber, bankAgency) === verificationDigit;
+ }
+
+  private getAccountVerificationDigit(accountNumber:string, agencyNumber:string){
+    const sum = `${agencyNumber}${accountNumber}`.split("").map(Number).reduce((acc,cur,index) => acc + cur * (11-index),0);
+    const rest = (sum - Math.trunc(sum / 11) * 11);
+    if (rest > 1) return (11 - rest).toString()
+    return "0"
+  }
+}
diff --git a/src/utilities/conta-bancaria/validators/hsbc.ts b/src/utilities/conta-bancaria/validators/hsbc.ts
new file mode 100644
index 00000000..ef55e236
--- /dev/null
+++ b/src/utilities/conta-bancaria/validators/hsbc.ts
@@ -0,0 +1,23 @@
+import { BankValidator } from "./bankValidator";
+
+export class HSBCValidator extends BankValidator{
+  private agencyMultiplicationWeights = [8,9,2,3];
+
+  protected isValidFormat(bankAccount: string, agencyNumber:string): boolean {
+    return /^\d{6}\-\d{1}$/.test(bankAccount) && /^\d{4}$/.test(agencyNumber);
+  }
+
+  protected checkDV(bankAccount: string, bankAgency:string): boolean {
+    const accountNumber = bankAccount.split("-")[0];
+    const verificationDigit = bankAccount.split("-")[1];
+    return this.getAccountVerificationDigit(accountNumber, bankAgency) === verificationDigit;
+ }
+
+  private getAccountVerificationDigit(accountNumber:string, agencyNumber:string){
+    const agencySum = agencyNumber.split("").map(Number).reduce((acc,cur,index) => acc + cur * this.agencyMultiplicationWeights[index],0);
+    const accountSum = accountNumber.split("").map(Number).reduce((acc,cur,index) => acc + cur * (index + 4),0);
+    const rest = (agencySum+accountSum)%11;
+    if (rest === 10) return "0"
+    return  rest.toString();
+  }
+}
diff --git a/src/utilities/conta-bancaria/validators/itau.ts b/src/utilities/conta-bancaria/validators/itau.ts
new file mode 100644
index 00000000..759b6f24
--- /dev/null
+++ b/src/utilities/conta-bancaria/validators/itau.ts
@@ -0,0 +1,35 @@
+import { isEven } from "../../../helpers";
+import { BankValidator } from "./bankValidator";
+
+export class ItauValidator extends BankValidator{
+  protected isValidFormat(bankAccount: string, agencyNumber:string): boolean {
+    return /^\d{5}\-\d{1}$/.test(bankAccount) && /^\d{4}$/.test(agencyNumber);
+  }
+
+  protected checkDV(bankAccount: string,  agencyNumber:string): boolean {
+    const account = bankAccount.split("-")[0];
+    const verificationDigit = bankAccount.split("-")[1];
+    return this.getAccountVerificationDigit(account, agencyNumber) === verificationDigit;
+  }
+
+  private getAccountVerificationDigit(accountNumber:string, agencyNumber:string){
+    const agencySum = agencyNumber.split("").map(Number).reduce((acc,cur, index)=> {
+      const digitMultiplication = cur * (isEven(index + 1)? 1 : 2)
+      return acc + (digitMultiplication > 9 ? this.sumDigits(digitMultiplication) : digitMultiplication)
+    } ,0);
+    const accountNumberSum = accountNumber.split("").map(Number).reduce((acc,cur, index)=> {
+      const digitMultiplication = cur * (isEven(index + 1)? 1 : 2)
+      return acc + (digitMultiplication > 9 ? this.sumDigits(digitMultiplication) : digitMultiplication)
+    } ,0);
+    const rest = (agencySum+accountNumberSum)%10;
+    return  (10 - rest).toString();
+  }
+
+  private sumDigits(number:number):number{
+    return number
+    .toString()
+    .split('')
+    .map(Number)
+    .reduce((a, b) => a + b, 0);
+  }
+}
diff --git a/src/utilities/conta-bancaria/validators/real.ts b/src/utilities/conta-bancaria/validators/real.ts
new file mode 100644
index 00000000..f582275b
--- /dev/null
+++ b/src/utilities/conta-bancaria/validators/real.ts
@@ -0,0 +1,25 @@
+import { BankValidator } from "./bankValidator";
+
+export class RealValidator extends BankValidator{
+
+  private multiplicationWeights = [8,1,4,7,2,2,5,9,3,9,5];
+
+  protected isValidFormat(bankAccount: string, agencyNumber:string): boolean {
+    return /^\d{7}\-\d{1}$/.test(bankAccount) && /^\d{4}$/.test(agencyNumber);
+  }
+
+  protected checkDV(bankAccount: string, bankAgency:string): boolean {
+    const accountNumber = bankAccount.split("-")[0];
+    const verificationDigit = bankAccount.split("-")[1];
+    return this.getAccountVerificationDigit(accountNumber, bankAgency) === verificationDigit;
+ }
+
+  private getAccountVerificationDigit(accountNumber:string, agencyNumber:string){
+    const sum = `${agencyNumber}${accountNumber}`.split("").map(Number).reduce((acc,cur,index) => acc + cur * this.multiplicationWeights[index],0);
+    const rest = (sum - Math.trunc(sum / 11) * 11);
+
+    if (rest === 1) return "0"
+    if (rest === 0) return "1"
+    return  (11 - rest).toString();
+  }
+}
diff --git a/src/utilities/conta-bancaria/validators/santander.ts b/src/utilities/conta-bancaria/validators/santander.ts
new file mode 100644
index 00000000..55d0340d
--- /dev/null
+++ b/src/utilities/conta-bancaria/validators/santander.ts
@@ -0,0 +1,33 @@
+import { BankValidator } from "./bankValidator";
+
+export class SantanderValidator extends BankValidator{
+  private accountTypes = ["01","02","03","05","07","09","13","27","35","37","43","45","46","48","50","53","60","92"];
+  private agencyMultypliers = [9,7,3,1];
+  private accountMultypliers = [9,7,1,3,1,9,7,3];
+
+  protected isValidFormat(bankAccount: string, bankAgency:string): boolean {
+    return this.checkAccountType(bankAccount) && /^\d{8}\-\d{1}$/.test(bankAccount) && /^\d{4}$/.test(bankAgency);
+ }
+
+ protected checkDV(bankAccount: string, bankAgency:string): boolean {
+   const accountNumber = bankAccount.split("-")[0];
+   const verificationDigit = bankAccount.split("-")[1];
+
+   return this.getAccountVerificationDigit(accountNumber,bankAgency) === verificationDigit;
+ }
+
+ private getAccountVerificationDigit(accountNumber:string, agencyNumber:string){
+  const agencySum = agencyNumber.split("").map(Number).reduce((acc,cur,index)=> acc + this.getLastDigit(cur * this.agencyMultypliers[index]),0);
+  const accountSum = accountNumber.split("").map(Number).reduce((acc,cur,index)=> acc + this.getLastDigit(cur * this.accountMultypliers[index]),0);
+  return  (10 - this.getLastDigit(agencySum+accountSum)).toString()
+}
+
+ private getLastDigit(number:number){
+   return parseInt(number.toString().slice(-1))
+ }
+
+ private checkAccountType(bankAccount:string): boolean {
+   const accountType = bankAccount.slice(0,2);
+  return this.accountTypes.includes(accountType);
+ }
+}