Lesson 14 Towers of 10
Let’s figure out how many cubes are hidden.
Warm-up What Do You Know About …?
What do you know about 10?
Activity 1 Introduce What’s Behind My Back?, 10 Cubes
We are going to learn a new way to play the What’s Behind My Back? center.
Activity 2 How Many Cubes Are Hidden?
Han had a tower of 10 cubes.
He snapped it into 2 parts and hid 1 part behind his back.
He showed his partner 4 cubes.
How many cubes is Han hiding behind his back?
Activity 3 Centers: Choice Time
Choose a center.
What’s Behind My Back?
![Center. What's Behind My Back.](../../../../../downloads/04de3281--2.1.A-Student-Pages.ConnectingTowers-(1).png)
Math Fingers
![Center activity. Math fingers.](../../../../../downloads/c87ae532--image27.png)
Shake and Spill
![Center. Shake and Spill.](../../../../../downloads/aaf17ece--cup-counters.png)
Counting Collections
![Center. Counting Collections.](../../../../../downloads/3de1e05f--counting-collections-illustration.png)
Roll and Add
![Center activity. Roll and Add.](../../../../../downloads/fe9e30b4--Roll-and-Add.png)
Practice Problem
Problem 1
Mai has a tower of 10 connecting cubes.
She snaps the tower into 2 parts and puts one part behind her back.
She shows her partner 3 cubes.
How many cubes is Mai hiding?
Show your thinking using drawings, numbers, words, or objects.