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
Find the value of each sum.
What patterns did you notice?
Activity 2 Card Sort: Perfect Ten
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.
Pick 1 pair of numbers and find the value of their sum. Show your thinking.
Find the value of each sum. Show your thinking.