# Foundations for Addition and Subtraction Within 20

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Resource Type Lesson Plan
Standards Alignment
Common Core State Standards

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This resource is the overview of a 3 lesson module. Topics A-C lessons 1-2. This resource includes the overview, lesson plans and activities. The resource is from EngageNY and licensed through Creative Commons. http://creativecommons.org/licenses/by-nc-sa/3.0/us
Aligned with 2.OA.1, 2.OA.2, K.OA.3, K.OA.4, K.NBT.1, 1.OA.6

## Resources

Files

G2-M1-A-Lesson_1.docx

Lesson Plan
February 13, 2020
1.7 MB

G2-M1-A-Lesson_2.docx

Lesson Plan
February 13, 2020
1.7 MB

G2-M1-A-Topic_Overview.docx

February 13, 2020
0.2 MB

### Standards

Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).
For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation.
Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (e.g., 18 = 10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.

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