Curriculum  /  Math  /  2nd Grade  /  Unit 2: Adding and Subtracting Within 100  /  Lesson 5

Adding and Subtracting Within 100

Lesson 5

Math

Unit 2

2nd Grade

Lesson 5 of 21

Objective

Use math drawings to represent adding within 100.

Student-Facing

I can use place value drawings to add within 100.

Common Core Standards

Core Standards

  • 2.NBT.B.5 — Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

Foundational Standards

  • 1.NBT.C.4
  • 1.NBT.C.5
  • 1.NBT.C.6

Criteria for Success

  1. Understand that two-digit numbers are composed of tens and ones.
  2. Compose a given two-digit number using appropriate representations of drawn tens and ones. 
  3. Combine two sets of built two-digit numbers to find the total. 
  4. Understand that 10 ones equals a new ten in situations where there are more than 9 ones. 

Tips for Teachers

Lesson Materials

  • Base ten blocks (7 ten rods and 9 ones cubes for teacher)
  • Tens place value chart (1 per student) — These should be laminated or in page protectors to reuse
  • Sheet protectors (1 per student)
  • Dry erase marker (1 per student)

Warm Up

5-10 minutes

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Anchor Tasks

15-25 minutes

Problem 1

Cynthia used a base ten drawing to add 42 and 29 but didn't finish. 

a.   Help her complete her thinking by completing the place value chart.

b.   What equation represents this situation?

c.   Describe how you found the total.

Purpose

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Set Up

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Problem 2

Hector built the number 53. Jendaya built the number 37. 

a.   Write the problem used to find that total of their numbers.

b.   Use a place value chart to show how you would find the total.

c.   What is the total of Hector's and Jendaya's numbers?

Purpose

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Problem 3

Use a drawing to show how you would find the total using a place value chart.

a.   50 + 45 =

b.   49 + 23 =

c.   82 + 14 =

Purpose

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Problem Set

15-20 minutes

Target Task

5-10 minutes

Use place value drawing to solve. 

a.   58 + 21 = _____

b.   73 + 19 = _____

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.

Word Problems and Fluency Activities

Next

Use place value knowledge to add within 100.

Lesson 6
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Lesson Map

A7CB09C2-D12F-4F55-80DB-37298FF0A765

Topic A: Adding & Subtracting with Multiples of Ten

Topic B: Strategies for Adding within 100

Topic C: Strategies for Subtracting within 100

Topic D: Working within 100 and Categorical Data

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