diff --git a/built-in.js b/built-in.js
new file mode 100644
index 0000000..ff135c2
--- /dev/null
+++ b/built-in.js
@@ -0,0 +1,3 @@
+console.log("Math.PI", Math.PI);
+console.log("Math.random()", Math.random());
+console.log("Math.floor(3,9)", Math.floor(3.9));
\ No newline at end of file