Lesson 6 Use a Ten to Add Within 1,000

    • Let’s add three-digit numbers by composing a ten.

Warm-up Number Talk: Numbers that Make 10

Find the value of each expression mentally.

Activity 1 Add Two-digit and Three-digit Numbers

  1. Find the value of each sum.

    Set 1

    Set 2

    Set 3

  2. What patterns did you notice?

Activity 2 Card Sort: Perfect Ten

  1. Match each three-digit number to a two-digit number. When you add your numbers together they should make a ten with no extra ones.

  2. Pick 1 pair of numbers and find the value of their sum. Show your thinking.

Practice Problem

Problem 1

Find the value of each sum. Show your thinking.