Done

index.js

@@ -0,0 +1,41 @@
+function add() {
+  return number+number;
+}
+function subtract() {
+  return number-number;
+}
+function multiply() {
+  return numner*number;
+}
+function divide() {
+  return number/number;
+}
+function add(a,b) {
+  return a+b;
+}
+function subtract(a,b) {
+  return a-b;
+}
+function multiply(a,b) {
+  return a*b;
+}
+function divide(a,b) {
+  return a/b;
+}
+var number 
+function increment(n) {
+  number = n+1;
+  return number;
+}
+function decrement(n) {
+  number = n-1;
+  return number 
+}
+function makeInt(n) {
+  number = parseInt(n, 10);
+  return number;
+}
+function preserveDecimal(n) {
+  number = parseFloat(n, 10);
+  return number;
+}