diff --git a/lessons/04_math.claro b/lessons/04_math.claro
new file mode 100644
index 0000000..f1fabe7
--- /dev/null
+++ b/lessons/04_math.claro
@@ -0,0 +1,5 @@
+SAY "Lesson 4: Math"
+SET apples TO 3
+SET oranges TO 2
+SET total TO apples + oranges
+SAY total