Number Talks

## Collection Contents

### Mental Math Addition Strategies: Doubles, doubles plus/minus 1, make a 10

by Debbie Stoddard

Write near double fact (6+7): ask for student strategies (6+6+1, 7+7-1) Make a 10 ( 9+5, 9 becomes 10 or add 10 and subtract 1)
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### Numberline numbers

by Debbie Stoddard

Friendly numbers (43 + 27 add tens, then ones) Moving 27 to 30, adding on. Relating compensation strategies to the number line. (43 + 27 = 43 + 20 + 7 or 43 + 27 = 43 + 7 + 20) Addition in any order, compensation, decomposition of numbers
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### Subtraction strategies

by Debbie Stoddard

, Numberline Age Talk, Nine grows to 10. Place a seven year old on the number line and an older sibling on 12. Discuss the difference in ages. Ask how old will you be next year? Your sibling? What is the difference in ages? When you are nine, how old? When sibling 15 how old will you be? When you are 9 how old sibling? Ten? How does knowing about the number line and ages help me change 17-9 to an easier problem? Can we apply this idea to 21-8? 42-17?
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### Number Composition: What makes 100?

by Debbie Stoddard

A talk about place value, tens and ones and how they construct 100 ie. 59+41 is nine tens and 10 ones. Builds place value understanding that 100 = 90 + 10.
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