Grade 1 Mathematics Module 4, Topic A, Lesson 5

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Objective: Identify 10 more, 10 less, 1 more, and 1 less than a two-digit number.

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Common Core Learning Standards

CCLS State Standard
1.NBT.5 Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count...

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