Grade 1 Mathematics Module 2, Topic B, Lesson 21

students reading

Objective: Share and critique peer solution strategies for take from with result unknown and take apart with addend unknown word problems from the teens.

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Common Core Learning Standards

CCLS State Standard
1.OA.1 Use addition and subtraction within 20 to solve word problems involving situations of adding to,...
1.OA.4 Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the...
1.OA.6 Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use...

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