diff --git a/Maths/decimalIsolate.js b/Maths/decimalIsolate.js
new file mode 100644
index 000000000..aae6e8ed7
--- /dev/null
+++ b/Maths/decimalIsolate.js
@@ -0,0 +1,17 @@
+/*
+ * function isolates the decimal part of a number.
+ * Take the number and subtract it from the floored number.
+ * Return the result.
+ */
+
+const decimalIsolate = (number) => {
+  const ans = parseFloat((number + '').replace(/^[-\d]+./, '.'))
+  return isNaN(ans) === true ? 0 : ans
+}
+
+// testing
+console.log(decimalIsolate(35.345))
+console.log(decimalIsolate(56.879))
+console.log(decimalIsolate(89.5643))
+console.log(decimalIsolate(38.00))
+console.log(decimalIsolate(33))