diff --git a/src/multiplication.c b/src/multiplication.c
index b583823..143fa25 100644
--- a/src/multiplication.c
+++ b/src/multiplication.c
@@ -48,5 +48,17 @@ int multiply_by_sum(int num1, int num2) {
     return num1 * (num2 + 1);
 }
 
+int multiply_using_two_complements(int num1, int num2) {
+    int result = 0;
+    while (num1 != 0) {
+        if (num1 & 1) {
+            result += num2;
+        }
+        num1 >>= 1;
+        num2 <<= 1;
+    }
+    return result;
+}
+
     
 
diff --git a/src/multiplication.h b/src/multiplication.h
index 77be6d8..dd99a1f 100644
--- a/src/multiplication.h
+++ b/src/multiplication.h
@@ -10,6 +10,7 @@ float multiply_by_percentage(float num, float percentage);
 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);
 
 
 #endif // MULTIPLICATION_H