diff --git a/du3/program.c b/du3/program.c
index 20f6bcf..07b6f92 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -18,7 +18,7 @@ int IsArithCorrect(float num1, float num2, char* op, float result)
         break;
 
         case '+':
-        if ((num1-num2) == result) { return 1;}
+        if ((num1+num2) == result) { return 1;}
         break;
 
         case '*':
@@ -27,7 +27,7 @@ int IsArithCorrect(float num1, float num2, char* op, float result)
 
         case '/':
         if (num2 == 0) { return -1;}
-        if ((num1-num2) == result) { return 1;}
+        if ((num1/num2) == result) { return 1;}
         break;
     }