### Home > MC1 > Chapter 7 > Lesson 7.2.5 > Problem7-98

7-98.

Use mental math strategies to solve the following problems in your head. Record the strategy that you used for each problem and the answer.

1.  $275 + 187$

The Lesson 3.1.2 Math Notes box describes three useful strategies. Try using ''Pulling Apart'' for this one.
You could think of $275$ as $200 + 75$ and $187$ as $100 + 25 + 62$.

You can rearrange the parts so that this sum is $200 + 100 + 75 + 25 + 62$.

$462$

2.  $201 − 97$

What is $200 − 97$? Can you adjust this for $201 − 97$?

$104$

3.  $26 + 129$

Try using ''Give and Take'' for this one!