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UNIT 3
CHAPTER 9
Lesson 9-3
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CHAPTER 9 ADDITION STRATEGIES
Lesson 9-3 Estimate Sums
Estimate Sums
Name ___________________________
estimate
:
You can
estimate
sums.
Will 9 + 3 be more than 10 or less than 10?
Think: I know 9 + 1 = 10.
3 is more than 1,
so 9 + 3 is more than 10.
12 is more than 10.
Estimate the sum. Add to check.
Use the number line.
1.
2.
more than 10
less than 10
3.
more than 10
less than 10
4.
more than 9
less than 9
5.
How would you estimate if 9 + 3 is more than 9 or less than 9?
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