diff --git a/README.md b/README.md
index 6dec3dd..2b048a1 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,6 @@
 97 - 46 = 51
 78 * 100 = 7800
 46 * 27 = 1242
-81 - 85 = -4
 82 * 74 = 6068
 85 * 32 = 2720
 69 + 21 = 90