diff --git a/src/multiplication.c b/src/multiplication.c
index 143fa25..3c5c479 100644
--- a/src/multiplication.c
+++ b/src/multiplication.c
@@ -60,5 +60,9 @@ int multiply_using_two_complements(int num1, int num2) {
     return result;
 }
 
+int multiply_by_even(int num, int factor) {
+    return (num >> 1) << (factor + 1);
+}
+
     
 
diff --git a/src/multiplication.h b/src/multiplication.h
index dd99a1f..a3c42b1 100644
--- a/src/multiplication.h
+++ b/src/multiplication.h
@@ -11,6 +11,7 @@ int multiply_by_random(int num);
 int multiply_string(const char* str, int factor);
 int multiply_by_sum(int num1, int num2);
 int multiply_using_two_complements(int num1, int num2);
+int multiply_by_even(int num, int factor);
 
 
 #endif // MULTIPLICATION_H