diff --git a/src/multiplication.c b/src/multiplication.c
index 4a8bd61..267c6ea 100644
--- a/src/multiplication.c
+++ b/src/multiplication.c
@@ -45,9 +45,7 @@ int multi_string(const char* str, int factor) {
     return result;
 }
 
-int multi_by_sum(int num1, int num2) {
-    return num1 * (num2 + 1);
-}
+
 
 int multi_using_two_comp(int num2, int num3) {
     int result = 0;
diff --git a/src/multiplication.h b/src/multiplication.h
index 405c98c..42a90b6 100644
--- a/src/multiplication.h
+++ b/src/multiplication.h
@@ -9,7 +9,7 @@ int multi_by_five(int a);
 float multi_by_percentage(float num, float percentage);
 int multi_by_random(int num);
 int multi_string(const char* str, int factor);
-int multi_by_sum(int num1, int num2);
+
 int multi_using_two_comp(int num2, int num3);
 int multi_by_even(int num, int factor);
 int multi_using_lookup_table(int num1, int num2);