Done

index.js

@@ -0,0 +1,33 @@
+var number;
+function add(a,b){
+  number=a+b;
+  return number;
+}
+function subtract(a,b){
+  number=a-b;
+  return number;
+}
+function multiply(a,b){
+  number=a*b;
+  return number;
+}
+function divide(a,b){
+  number=a/b;
+  return number;
+}
+function increment(a){
+  number=a+1;
+  return number;
+}
+function decrement(a){
+  number=a-1;
+  return number;
+}
+function makeInt(a){
+  number=parseInt(a,10);
+  return number
+}
+function preserveDecimal(a){
+  number=parseFloat(a,10);
+  return number;
+}