diff --git a/maths/decimal_isolation.ts b/maths/decimal_isolation.ts
new file mode 100644
index 00000000..b25faabb
--- /dev/null
+++ b/maths/decimal_isolation.ts
@@ -0,0 +1,23 @@
+/**
+ * @function isolateDecimal
+ * @description Isolate the decimal part of a number.
+ * @param {number} num - The number to isolate the decimal part from.
+ * @returns {Object} - Object containing the integral part and the decimal part.
+ * @throws {TypeError} - when the input is not a number.
+ * @example isolateDecimal(3.14) => { integralPart: 3, decimalPart: 0.14 }
+ */
+
+export const isolateDecimal = (
+ num: number
+): { integralPart: number; decimalPart: number } => {
+ if (typeof num !== 'number') {
+ throw new TypeError('Input must be a number')
+ }
+
+ num = Math.abs(num)
+
+ const integralPart = Math.trunc(num)
+ const decimalPart = num - integralPart
+
+ return { integralPart, decimalPart: Number(decimalPart.toFixed(10)) }
+}
diff --git a/maths/test/decimal_isolation.test.ts b/maths/test/decimal_isolation.test.ts
new file mode 100644
index 00000000..0c4d24aa
--- /dev/null
+++ b/maths/test/decimal_isolation.test.ts
@@ -0,0 +1,16 @@
+import { isolateDecimal } from '../decimal_isolation'
+
+describe('isolateDecimal', () => {
+ test('isolate the decimal part of a number', () => {
+ expect(isolateDecimal(3.14)).toEqual({ integralPart: 3, decimalPart: 0.14 })
+ expect(isolateDecimal(0.14)).toEqual({ integralPart: 0, decimalPart: 0.14 })
+ expect(isolateDecimal(-3.14)).toEqual({
+ integralPart: 3,
+ decimalPart: 0.14
+ })
+ })
+
+ test('throws an error when the input is not a number', () => {
+ expect(() => isolateDecimal('3.14' as unknown as number)).toThrow(TypeError)
+ })
+})
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