diff --git a/src/Calculadora.php b/src/Calculadora.php
index 896ceeb..177ae52 100644
--- a/src/Calculadora.php
+++ b/src/Calculadora.php
@@ -4,14 +4,14 @@
 
 class Calculadora {
     public function sumar($a, $b) {
-        return $a + $b;
+        return $a + $b - 1;
     }
 
     public function restar($a, $b) {
-        return $a - $b;
+        return $a - $b * 4;
     }
 
     public function multiplicar($a, $b) {
-        return $a * $b;
+        return $a * $b + 5;
     }
 }