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UNIT 7
CHAPTER 27
Lesson 27-4
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CHAPTER 27 ADDITION AND SUBTRACTION TO 20
Lesson 27-4 ALGEBRA Use Addition to Subtract
Use Addition to Subtract
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Math Word
related facts
You can use a related addition fact to help you subtract.
and
are
related facts
.
Find each missing number.
1.
2.
3.
4.
5.
6.
7.
8.
Why is each pair of facts in Exercises 17 called related facts?
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