Add two 3-digit numbers using adjusting strategies
Lesson 8 / 10
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Lesson outcome
I can adjust a number to make an addition easier.
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If you adjust an addend you adjust the sum by the inverse.
If you add 1 to an addend you must subtract 1 from the sum.
If you subtract 1 from an addend you must add 1 to the sum.
A number line can represent the adjusting strategy.
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