diff --git a/Maths/decimalIsolate.js b/Maths/decimalIsolate.js
new file mode 100644
index 000000000..30b164089
--- /dev/null
+++ b/Maths/decimalIsolate.js
@@ -0,0 +1,15 @@
+/*
+ * function isolates the decimal part of a number.
+ * Take the number and subtract it from the floored number.
+ * Return the result.
+ */
+
+const decimalIsolate = (number) => {
+    return number - Math.floor(number)
+
+}
+
+// testing
+console.log(decimal_isolate(35.345))
+console.log(decimal_isolate(56.879))
+console.log(decimal_isolate(89.5643))