Curriculum / Math / 2nd Grade / Unit 1: Addition and Subtraction Within 20 / Lesson 8

Addition and Subtraction Within 20

Lesson 8

Math

Unit 1

2nd Grade

Lesson 8 of 13

Objective

Subtract within 20 by thinking of it as an unknown-addend problem.

Student-Facing

I can subtract by relating it to addition.

Lesson Map

Topic A: Adding and Subtracting within 10 and Counting

Lesson

Find the value of addition and subtraction expressions where the total is within 10.

Standards

2.OA.B.2

Lesson

Find the value that makes equations true where the total is 10.

Standards

2.OA.B.2

Lesson

Find the value that makes equations true where the total is less than or equal to 10.

Standards

2.OA.B.2

Lesson

Count by ones and tens within 200.

Standards

2.NBT.A.2

Topic B: Adding and Subtracting within 20

Lesson

Find the value that makes equations true where one part is 10 or a teen number.

Standards

2.OA.B.2

Lesson

Add within 20 by making a ten.

Standards

2.OA.B.2

Lesson

Subtract within 20 by going down over ten.

Standards

2.OA.B.2

Lesson

Subtract within 20 by thinking of it as an unknown-addend problem.

Standards

2.OA.B.2

Lesson

Add and subtract within 20 using doubles and near doubles.

Standards

2.OA.B.2

Lesson

Add and subtract within 20 and explain why strategies work.

Standards

2.OA.B.2

Topic C: Story Problems within 20

Lesson

Solve easy and middle difficulty add to, take from, and put together/take apart story problems using any way that makes sense to them.

Standards

2.OA.A.12.OA.B.2

Lesson

Solve easy and middle difficulty story problems using tape diagrams and equations.

Standards

2.OA.A.12.OA.B.2

Lesson

Solve add to and take from with start unknown story problems.

Standards

2.OA.A.12.OA.B.2

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Addition and Subtraction Within 20

Objective

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Student-Facing

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