Lesson 3 Snap the Cubes

    • Let’s find different ways to break apart numbers.

Warm-up Notice and Wonder: Connecting Cube Towers

What do you notice?
What do you wonder?

2 connecting cube towers. Blue, 3 and Blue, 3.
Sample student response.
Connecting cubes. Single cube. Tower of 5.

Activity 1 Introduce What’s Behind My Back, Show 2 Parts

8 cubes

8 blank cubes.


expression:

8 blank cubes.


expression:

8 blank cubes.


expression:

8 blank cubes.


expression:

8 blank cubes.


expression:

8 blank cubes.


expression:

8 blank cubes.


expression:

8 blank cubes.


expression:

8 blank cubes.


expression:

Activity 2 More Than One Way

Activity 3 Centers: Choice Time

Choose a center.

What’s Behind My Back?

Center. What's Behind My Back.

Check it Off

Center. Check It Off.

Bingo

Center. Bingo.

Find the Value of
Expressions

Center activity. Find the Value of Expressions.

Shake and Spill

Center. Shake and Spill.


Practice Problem

Problem 1

Mai wanted to break apart 7 into 2 parts.
She made this tower to show her 2 parts.

1 connecting cube tower. Blue, 5. Yellow, 2.

  1. Write an expression for Mai’s connecting cubes.

  2. Show 1 more way to break apart 7 cubes into 2 parts.
    Show your thinking using drawings, numbers, words, or objects.