Lesson 3 | Adding and Subtracting Within 1,000 | 2nd Grade Mathematics

Objective

Use the associative property to make a multiple of 100 or multiple of 10 to add.

Student-Facing

I can make 100 or more than one 10 to add.

Common Core Standards

Core Standards

The core standards covered in this lesson

2.NBT.B.7 — Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Number and Operations in Base Ten

2.NBT.B.7 — Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Foundational Standards

The foundational standards covered in this lesson

1.NBT.B.2

Number and Operations in Base Ten

1.NBT.B.2 — Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
2.NBT.A.1

Number and Operations in Base Ten

2.NBT.A.1 — Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:
2.NBT.A.2

Number and Operations in Base Ten

2.NBT.A.2 — Count within 1000; skip-count by 5s, 10s, and 100s.

Criteria for Success

The essential concepts students need to demonstrate or understand to achieve the lesson objective

Decompose addend to compose a multiple of hundreds or tens with other addends.
Make a multiple 100 or multiple 10 to add using arrow notation, empty number line, or mental math to add by place value.

Tips for Teachers

Suggestions for teachers to help them teach this lesson

Students will continue to use number bonds to decompose addends similar to the work students did in Unit 2. They should prioritize making a hundred or multiple of 100 or multiple of 10 to add as they did in the previous lesson.

Warm Up

5-10 minutes

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Anchor Tasks

Tasks designed to teach criteria for success of the lesson, and guidance to help draw out student understanding

15-25 minutes

Problem 1

Cici wanted to add 145 + 98 but didn’t have base ten blocks.

She noticed that 98 is close to 100. How can she use that to help her solve?

145 + 98 = _____

Purpose

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Problem 2

Make a friendly number to add. Show your thinking.

a. 199 + 86 = _____

b. 234 + 58 = _____

c. 125 + 398 = _____

d. 599 + 273 = _____

e. 629 + 96 = _____

f. 414 + 77 = _____

Purpose

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Problem Set

15-20 minutes

Target Task

A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved

5-10 minutes

Make a friendly number to add.

a. 397 + 54 = _____

b. 145 + 498 = _____

c. 99 + 578 = _____

d. 211 + 79 = _____

Student Response

Additional Practice

Daily Word Problems, Warm Ups, and Center Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.

Adding and Subtracting Within 1,000

Objective

Add a note

Are You Sure?

Student-Facing

Common Core Standards

Core Standards

Number and Operations in Base Ten

Foundational Standards

Number and Operations in Base Ten

Number and Operations in Base Ten

Number and Operations in Base Ten

Criteria for Success

Add a note

Are You Sure?

Tips for Teachers

Add a note

Are You Sure?

Warm Up

Add a note

Are You Sure?

Anchor Tasks

Add a note

Are You Sure?

Problem 1

Add a note

Are You Sure?

Purpose

Problem 2

Add a note

Are You Sure?

Purpose

Problem Set

Add a note

Are You Sure?

Target Task

Add a note

Are You Sure?

Student Response

Additional Practice

Word Problems and Fluency Activities

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