Grade 1 Mathematics Module 4, Topic F, Lesson 27

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Objective: Add a pair of two-digit numbers when the ones digits have a sum greater than ten.

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Common Core Learning Standards

CCLS State Standard
1.NBT.4 Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit...
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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