Lesson 16 Subtract Within 1,000

    • Let’s subtract in a way that makes sense.

Warm-up True or False: Equations Based on Place Value

Decide if each statement is true or false. Be prepared to explain your reasoning.

  1. 2 hundreds 3 tens 4 ones 2 hundreds 3 tens 14 ones

  2. 2 hundreds 3 tens 4 ones 1 hundred 13 tens 4 ones

  3. 1 hundred 13 tens 4 ones 1 hundred 12 tens 14 ones

Activity 1 Jada’s Thinking

Problem 1

Lin’s diagram:

Base ten diagram. 5 hundreds, 1 hundred crossed out. 7 tens, 4 crossed out. 12 ones, 5 crossed out.

Jada’s equations:

Method for decomposing 582 minus 145.

  1. Discuss how Jada’s equations match Lin’s diagram.

  2. Finish Jada’s work to find the value of

Problem 2

Jada is thinking about how to find the value of

  1. Jada says she knows a way to count on to find the difference. She showed her thinking using a number line.

    Number line. No scale or tick marks. Arrow from 298 to 300, labeled 2. Arrow from 300 to 400, labeled 100. Arrow from 400 to 402, labeled 2.

    Explain Jada’s thinking.

  2. Jada says you can’t decompose to find the value of because there aren’t any tens. Do you agree with Jada? Use base-ten blocks, diagrams, or other representations to show your thinking.

Activity 2 Find It Your Way

Find the value of each expression in a way that makes sense to you. Show your thinking. Organize it so it can be followed by others.

Practice Problem

Problem 1

Find the value of each difference in a way that makes sense to you. Show your thinking.