diff --git a/README.md b/README.md
index 8dae517..02f1539 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 57 / 4 = 14
 64 - 61 = 3
 89 / 8 = 11
+61 - 51 = 10