diff --git a/index.js b/index.js
index e69de29bb2..4947c10de2 100644
--- a/index.js
+++ b/index.js
@@ -0,0 +1,47 @@
+function add(){
+  1 + 80
+}
+
+function subtract(){
+  60 - 40
+}
+
+function multiply(){
+  2 * 3.4
+}
+
+function divide(){
+  5.0 / 2.5
+}
+
+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)
+}
+
+function increment(n){
+  return (n += 1)
+}
+
+function decrement(n){
+  return (n -= 1)
+}
+
+function makeInt(n){
+  return parseInt(n, 10)
+}
+
+function preserveDecimal(n){
+  return parseFloat(n)
+}
\ No newline at end of file