diff --git a/packages/typescript/src/arithmeticOp/index.ts b/packages/typescript/src/arithmeticOp/index.ts
new file mode 100644
index 0000000..b71217a
--- /dev/null
+++ b/packages/typescript/src/arithmeticOp/index.ts
@@ -0,0 +1,87 @@
+/**
+ * Represents a class for performing arithmetic operations.
+ */
+export default class ArithmeticOp {
+	/**
+	 * Calculates the sum of the given numbers.
+	 * @param numbers - The numbers to be summed.
+	 * @returns The sum of the numbers.
+	 */
+	protected sum(...numbers: number[]): number {
+		return numbers.reduce((acc, curr) => acc + curr, 0);
+	}
+
+	/**
+	 * Calculates the difference between the given numbers.
+	 * @param numbers - The numbers to be subtracted.
+	 * @returns The difference between the numbers.
+	 */
+	protected sub(...numbers: number[]): number {
+		return numbers.reduce((acc, curr) => acc - curr);
+	}
+
+	/**
+	 * Calculates the product of the given numbers.
+	 * @param numbers - The numbers to be multiplied.
+	 * @returns The product of the numbers.
+	 */
+	protected mul(...numbers: number[]): number {
+		return numbers.reduce((acc, curr) => acc * curr, 1);
+	}
+
+	/**
+	 * Calculates the division of the given numbers.
+	 * @param numbers - The numbers to be divided.
+	 * @returns The division of the numbers.
+	 */
+	protected div(...numbers: number[]): number {
+		return numbers.reduce((acc, curr) => acc / curr);
+	}
+
+	/**
+	 * Calculates the modulo of the given numbers.
+	 * @param numbers - The numbers to be modded.
+	 * @returns The modulo of the numbers.
+	 */
+	protected mod(...numbers: number[]): number {
+		return numbers.reduce((acc, curr) => acc % curr);
+	}
+
+	/**
+	 * Calculates the power of the given base and exponent.
+	 * @param base - The base number.
+	 * @param exponent - The exponent number.
+	 * @returns The power of the base and exponent.
+	 */
+	protected power(base: number, exponent: number): number {
+		let result = 1;
+		for (let i = 0; i < exponent; i++) {
+			result *= base;
+		}
+		return result;
+	}
+
+	public getSum() {
+		return this.sum;
+	}
+
+	public getSub() {
+		return this.sub;
+	}
+
+	public getMul() {
+		return this.mul;
+	}
+
+	public getDiv() {
+		return this.div;
+	}
+
+	public getMod() {
+		return this.mod;
+	}
+
+	public getPower() {
+		return this.power;
+	}
+}
diff --git a/packages/typescript/src/generateCriticalPointInterval/index.ts b/packages/typescript/src/generateCriticalPointInterval/index.ts
new file mode 100644
index 0000000..8459a9b
--- /dev/null
+++ b/packages/typescript/src/generateCriticalPointInterval/index.ts
@@ -0,0 +1,6 @@
+export default function generateCriticalPointInterval(
+	min: number,
+	max: number,
+) {
+	return Math.random() * (max - min + 1) + min;
+}
diff --git a/packages/typescript/src/loganmatic.ts b/packages/typescript/src/loganmatic.ts
index 27290c1..e1e6c3c 100644
--- a/packages/typescript/src/loganmatic.ts
+++ b/packages/typescript/src/loganmatic.ts
@@ -1,5 +1,7 @@
 // Class that represents a calculator with some basic mathematical functions
 
+import ArithmeticOp from "./arithmeticOp";
+import generateCriticalPointInterval from "./generateCriticalPointInterval";
 import {
 	ReturnTypesForEquation,
 	ReturnTypesForEquation2upDegree,
@@ -13,11 +15,12 @@ const piValue: string = "3.1415926535897932384626433832795";
  * @example - import Mathematics from "loganmatic"
  * console.log(Mathematics.Pi)
  */
-class Calculator {
+class Calculator extends ArithmeticOp {
 	EulerNumber: number; // Declare EulerNumber property
 	Pi: number; // Declare Pi property
 
 	constructor() {
+		super();
 		this.EulerNumber = this.createEulerNumber();
 		this.Pi = parseFloat(piValue);
 	}
@@ -72,10 +75,6 @@ class Calculator {
 			criticalPoint1 = criticalPoint2 * -1;
 		}
 
-		function generateCriticalPointInterval(min: number, max: number) {
-			return Math.random() * (max - min + 1) + min;
-		}
-
 		let criticalPoint3: number;
 
 		if (answer1 > answer2) {
@@ -787,6 +786,10 @@ class Calculator {
 			);
 		}
 	}
+
+	public getRufinhoDevice() {
+		return this.ruffiniDevice;
+	}
 }
 
 // Create an instance of the Calculator class
diff --git a/packages/typescript/tests/arithmeticOp.test.ts b/packages/typescript/tests/arithmeticOp.test.ts
new file mode 100644
index 0000000..494ada7
--- /dev/null
+++ b/packages/typescript/tests/arithmeticOp.test.ts
@@ -0,0 +1,54 @@
+import ArithmeticOp from "../src/arithmeticOp/index";
+
+describe("ArithmeticOp", () => {
+	let arithmeticOp: ArithmeticOp;
+
+	beforeEach(() => {
+		arithmeticOp = new ArithmeticOp();
+	});
+
+	describe("sum", () => {
+		it("should calculate the sum of the given numbers", () => {
+			expect(arithmeticOp.getSum()(1, 2, 3)).toBe(6);
+			expect(arithmeticOp.getSum()(10, 20, 30, 40)).toBe(100);
+		});
+	});
+
+	describe("sub", () => {
+		it("should calculate the difference between the given numbers", () => {
+			expect(arithmeticOp.getSub()(5, 2)).toBe(3);
+			expect(arithmeticOp.getSub()(10, 5, 3)).toBe(2);
+		});
+	});
+
+	describe("mul", () => {
+		it("should calculate the product of the given numbers", () => {
+			expect(arithmeticOp.getMul()(2, 3)).toBe(6);
+			expect(arithmeticOp.getMul()(5, 10, 2)).toBe(100);
+		});
+	});
+
+	describe("div", () => {
+		it("should calculate the division of the given numbers", () => {
+			expect(arithmeticOp.getDiv()(10, 2)).toBe(5);
+			expect(arithmeticOp.getDiv()(100, 5, 2)).toBe(10);
+		});
+	});
+
+	describe("mod", () => {
+		it("should calculate the modulo of the given numbers", () => {
+			expect(arithmeticOp.getMod()(10, 3)).toBe(1);
+			expect(arithmeticOp.getMod()(100, 5, 3)).toBe(0);
+			expect(arithmeticOp.getMod()(100, 54, 6)).toBe(4);
+		});
+	});
+
+	describe("power", () => {
+		it("should calculate the power of the given base and exponent", () => {
+			expect(arithmeticOp.getPower()(2, 3)).toBe(8);
+			expect(arithmeticOp.getPower()(5, 3)).toBe(125);
+			expect(arithmeticOp.getPower()(-10, 2)).toBe(100);
+			expect(arithmeticOp.getPower()(-2, 3)).toBe(-8);
+		});
+	});
+});
diff --git a/packages/typescript/tests/equations.test.ts b/packages/typescript/tests/equations.test.ts
index 624f8cf..901a1af 100644
--- a/packages/typescript/tests/equations.test.ts
+++ b/packages/typescript/tests/equations.test.ts
@@ -1,6 +1,26 @@
 import Mathematics from "../src/loganmatic";
+import generateCriticalPointInterval from "../src/generateCriticalPointInterval/";
 
 describe("Calculadora equations", () => {
+	// loganmatic.test.ts
+
+	const rufineMethod = Mathematics.getRufinhoDevice();
+
+	test("getRufinhoDevice returns the expected result", () => {
+		// Substitua 'arg1', 'arg2', etc. pelos argumentos reais que getRufinhoDevice aceita
+		const result = rufineMethod(1, -6, 11, -6, [1, 3, 2], false);
+		// Substitua 'expectedResult' pelo resultado que você espera de getRufinhoDevice
+		expect(result.value).toEqual([1, 3, 2]);
+	});
+
+	test("generateCriticalPointInterval returns a value within the expected range", () => {
+		const min = 1;
+		const max = 10;
+		const result = generateCriticalPointInterval(min, max);
+		expect(result).toBeGreaterThanOrEqual(min);
+		expect(result).toBeLessThanOrEqual(max);
+	});
+
 	test("should correctly calculate the root of a linear equation", () => {
 		const equationRoot = Mathematics.linearEquation(2, 3);
 		expect(equationRoot).toEqual({