CHAPTER 28 EXPLORING 2-DIGIT ADDITION AND SUBTRACTION
Lesson 28-1 HANDS ON Add and Subtract Tens
Add or subtract. Use
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6.
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10.
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Reasoning
15.
Draw what was added. Complete the number sentence.
Your child added and subtracted multiples of 10.
Activity: Say the number
70 . Ask your child to count on 2 tens. Then ask your child to count back 2 tens.