Home > MC1 > Chapter 7 > Lesson 7.2.5 > Problem 7-98
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.
275 + 187
201 − 97
26 + 129
The Math Notes box below 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.
What is 200 − 97? Can you adjust this for 201 − 97?
Try using ''Give and Take'' for this one!
462
104
