Add LCM calculating for Mathematics module.

Java/Mathematics/LCM.java

@@ -0,0 +1,19 @@
+package Mathematics;
+
+import static Mathematics.EuclidGCD.gcd;
+
+/**
+ * Calculates lowest common multiple for given integer numbers
+ */
+public class LCM {
+    public static void main(String[] args) {
+        System.out.println(lcm(2, 5));
+        System.out.println(lcm(15, 3));
+        System.out.println(lcm(75, 10));
+    }
+
+    public static int lcm(int a, int b) {
+        return a * b / gcd(a, b);
+    }
+
+}