### Home > MC1 > Chapter 3 > Lesson 3.1.2 > Problem3-17

3-17.

Read the Math Notes box above. Show how you could use each of the three mental math strategies discussed to make each of the following computations.

1. $22+59$

Using the Give and Take method,
$59$ becomes $60$ and $22$ becomes $21$.

1. Challenge: $78−29$

Using the Overshoot and Adjust method,
$29$ becomes $30$.

Overshoot: $78−30=48$