Chapter 3.2, Problem 19MC

Read the compensation algorithm for addition on page $110$.Copy and complete all problems on the School Book Page.

School Book Page

$\begin{array}{l}1.\text{ 17 + 9 = \_\_\_\_}\\ \text{ + 3 }-\text{ 3}\\ \text{ 20 + 6 = 26}\end{array}$

$\begin{array}{l}2.\text{ 23 + 12 = \_\_\_}\\ ○\text{\_\_ }○\text{\_\_}\\ \_\_+\_\_=\_\_\_\end{array}$

$\begin{array}{l}3.\text{ 25 + 47 = \_\_\_}\\ ○\text{\_\_ }○\text{\_\_}\\ \_\_+\_\_=\_\_\_\end{array}$

$\begin{array}{l}4.\text{ 33 + 19 = \_\_\_}\\ ○\text{\_\_ }○\text{\_\_}\\ \_\_+\_\_=\_\_\_\end{array}$

$\begin{array}{l}5.\text{ 28 + 8 = \_\_\_}\\ ○\text{\_\_ }○\text{\_\_}\\ \_\_+\_\_=\_\_\_\end{array}$

$\begin{array}{l}6.\text{ 27 + 36 = \_\_\_}\\ ○\text{\_\_ }○\text{\_\_}\\ \_\_+\_\_=\_\_\_\end{array}$

7. Number Sense Explain how you can use compensation to make numbers that are easy to add. Solve. Show your work.

$\begin{array}{l}\text{ 28 + 37 = }\boxed{}\\ \\ \_\_+\_\_=\boxed{}\end{array}$

8. Higher order Thinking Show two different ways you could use compensation to make numbers that are easy to add. Solve. Show your work.

$\text{ 17 + 26 = }\boxed{}$