Lesson 4 Add and Subtract Your Way

    • Let’s add and subtract within 20.

Warm-up Number Talk: Make 10

Find the value of each sum mentally.

Activity 1 Revisit How Close?

Digit card. Number 5.
Digit card. Number 8.
Digit card. Number 2.
Digit card. Number 4.

Digit card. Number 6.

Activity 2 Add and Subtract within 20

Find the value of each expression.

Show your thinking using drawings, numbers, or words.

Practice Problem

Problem 1

Here are the numbers on seven cards:

  • 1

  • 2

  • 3

  • 5

  • 6

  • 7

  • 9

  1. Choose three of the numbers to add to get as close as you can to 20.

  2. Write an equation to show your choice.