diff --git a/README.md b/README.md
index 2f7ab75..9bbfff3 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,6 @@
 66 + 75 = 141
 73 / 2 = 36
 67 + 50 = 117
-66 - 57 = 9
 33 / 5 = 6
 74 / 5 = 14
 49 / 9 = 5