diff --git a/index.js b/index.js
index e69de29..4fc566e 100644
--- a/index.js
+++ b/index.js
@@ -0,0 +1,51 @@
+function add (a, b){
+  return a + b
+} 
+add (1, 80)
+
+function subtract (a, b){
+  return a - b
+} 
+subtract (60, 40)
+
+function multiply (a, b){
+  return a * b
+} 
+multiply (2, 3.4)
+
+function divide (a, b){
+  return a / b
+} 
+divide (5.0, 2.5)
+
+function inc (n){
+  var result = ++n
+  return result
+}
+inc (5)
+
+function dec (n){
+  var result = --n
+  return result
+}
+dec (5)
+
+function makeInt (n){
+return parseInt(n)
+}
+makeInt(7)
+
+function makeInt (n){
+return parseInt(n, 10)
+}
+makeInt(7.55)
+
+function preserveDecimal (n){
+return parseFloat(n)
+}
+preserveDecimal(7.55)
+
+function preserveDecimal (n){
+return parseFloat(n)
+}
+preserveDecimal('7')
\ No newline at end of file