Respuesta :

calvinrocks808

Answer:

Usally the fastest method to calculating a problem is to do it in your head. With enough practice your brain will be faster then most tools, ganing efficiency with practice.

Answer:

Step-by-step explanation:

In your head:

5 * 7 = 35  so its 5 point something with remainder 5.

7*7 = 49 so its  5.7 approximately.