diff --git a/index.js b/index.js
index e69de29..a75d6b6 100644
--- a/index.js
+++ b/index.js
@@ -0,0 +1,31 @@
+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 inc(n) {
+   return ++n;
+}
+
+function dec(n) {
+   return --n;
+}
+
+function makeInt(n) {
+   return parseInt(n, 10);
+}
+
+function preserveDecimal(n) {
+   return parseFloat(n);
+}
\ No newline at end of file