Lesson 10 Complete Equations

- Let’s write equations to show numbers 11–19.

Warm-up What Do You Know About …?

What do you know about 15?

Activity 1 What Is Missing?

$10 + 8 =$
$10 + 3 =$
$10 + 4 =$
$+$ $= 16$
$+$ $= 19$
$+$ $= 12$

Activity 2 Make the Equations True

Students working together.

Find the numbers that make each equation true. You can use objects, drawings, or 10-frames to help you.

$10 + 5 =$
$+$ $= 16$
$+$ $= 19$
$+$ $= 13$
$+$ $= 17$
$10 + 1 =$

Activity 3 Centers: Choice Time

Choose a center.

Bingo

Center. Bingo.

Number Race

Center. Number Race.

Grab and Count

Make or Break Apart Numbers

Center activity. Make or break apart numbers.

Tower Build

Center activity. Tower Build.

Practice Problem

Problem 1

Fill in the blanks to make each equation true.

$10 + 7 =$
$+$ $= 18$
$+$ $= 15$