Create find_lcm.js

- Created find_lcm.js
- Created maths folder

maths/find_lcm.js

@@ -0,0 +1,37 @@
+/*
+    author: PatOnTheBack
+    license: GPL-3.0 or later
+
+    Modified from:
+        https://github.com/TheAlgorithms/Python/blob/master/maths/find_lcm.py
+
+    More about LCM:
+        https://en.wikipedia.org/wiki/Least_common_multiple
+*/
+
+// Find the LCM of two numbers.
+function find_lcm(num_1, num_2) {
+    "use strict";
+    var max_num,
+        lcm;
+    // Check to see whether num_1 or num_2 is larger.
+    if (num_1 > num_2) {
+        max_num = num_1;
+    } else {
+        max_num = num_2;
+    }
+    lcm = max_num;
+
+    while (true) {
+        if ((lcm % num_1 === 0) && (lcm % num_2 === 0)) {
+            break;
+        }
+        lcm += max_num;
+    }
+    return lcm;
+}
+
+// Run `find_lcm` Function
+var num_1 = 12,
+    num_2 = 76;
+console.log(find_lcm(num_1, num_2));