Curriculum / Math / 1st Grade / Unit 4: Adding and Subtracting Within 20 / Lesson 9

Adding and Subtracting Within 20

Lesson 9

Math

Unit 4

1st Grade

Lesson 9 of 23

Objective

Add three numbers up to 20 when two of the numbers make a ten.

Student-Facing

I can make a ten when I add three numbers.

Lesson Map

Topic A: Developing Fluency

Lesson

Identify and write addition and subtraction equation relationships with totals up to 10.

Standards

1.OA.B.41.OA.C.6

Lesson

Find the missing number in addition and subtraction problems with totals of 10.

Standards

1.OA.C.61.OA.D.8

Lesson

Identify equivalent expressions within 10.

Standards

1.OA.D.7

Lesson

Solve add to story problems with start unknown within 10.

Standards

1.OA.A.11.OA.B.4

Lesson

Solve take from story problems with start unknown within 10.

Standards

1.OA.A.1

Topic B: Strategies For Adding Within 20

Lesson

Understand that 10 can be thought of as a unit, or group of 10 ones, called a ten.

Standards

1.NBT.B.2.A1.OA.D.8

Lesson

Add to find the total when one number partner is 10.

Standards

1.NBT.B.2.A1.OA.B.3

Lesson

Find the missing number in addition equations where the total is a teen number and one part is 10.

Standards

1.OA.B.31.OA.D.8

Lesson

Add three numbers up to 20 when two of the numbers make a ten.

Standards

1.OA.B.3

Lesson

Add within 20 by making a ten.

Standards

1.OA.B.31.OA.C.6

Lesson

Add within 20 using doubles and near doubles.

Standards

1.OA.C.6

Lesson

Add within 20 using any strategy.

Standards

1.OA.C.6

Lesson

Add within 20.

Standards

1.OA.C.6

Topic C: Strategies For Subtracting Within 20

Lesson

Find the missing number in subtraction equations where the total is a teen number and one part is 10.

Standards

1.OA.B.31.OA.B.4

Lesson

Subtract within 20 by making ten to subtract.

Standards

1.OA.B.41.OA.C.6

Lesson

Subtract within 20 by using the relationship between addition and subtraction.

Standards

1.OA.B.41.OA.C.6

Lesson

Subtract within 20 by using doubles and near doubles facts.

Standards

1.OA.B.41.OA.C.6

Lesson

Subtract within 20 using any strategy.

Standards

1.OA.C.6

Lesson

Subtract within 20.

Standards

1.OA.C.6

Topic D: Plenty of Problems (mixed problem types)

Lesson

Solve add to and take from problems with result or change unknown.

Standards

1.OA.A.11.OA.C.6

Lesson

Solve put together/take apart problems with total or addend unknown.

Standards

1.OA.A.11.OA.C.6

Lesson

Solve compare problems with difference, bigger, or smaller unknown (where language suggests the operation).

Standards

1.OA.A.11.OA.C.6

Lesson

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

Standards

1.OA.A.11.OA.C.6

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Adding and Subtracting Within 20

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