Section A: Practice Problems Make and Break Apart Numbers to 9

Section Summary

Details

In this section, we used objects to make and break apart numbers in different ways.

Pattern block design.

There are 8 pattern blocks.
There are 2 red trapezoids and 6 green triangles.

There are 8 pattern blocks.
There are 3 green triangles and 5 red trapezoids.

We wrote expressions to show different ways to make and break apart numbers.

There are 6 connecting cubes.
6 is .

There are 6 connecting cubes.
6 is .

Problem 1 (Lesson 1)

  1. 1 connecting cube tower. Blue, 3. 

    How can you break apart 3 connecting cubes into 2 parts?
    Show your thinking using drawings, numbers, words, or objects.

  2. 1 connecting cube tower. Blue, 5. 

    How can you break apart 5 connecting cubes into 2 parts?
    Show your thinking using drawings, numbers, words, or objects.

Problem 2 (Lesson 2)

Jada made this pattern block design.

Pattern block design.

  1. How many pattern blocks did Jada use?

  2. Write an expression to show Jada’s pattern blocks.

Problem 3 (Lesson 3)

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.

Problem 4 (Exploration)

Han made this pattern block design using two different kinds of pattern blocks.

Pattern block design.

He wrote the expression to describe his design.
What pattern blocks did Han use?

Problem 5 (Exploration)

  1. Show all the ways to snap a tower of 4 cubes into 2 parts.

  2. Show all the ways to snap a tower of 5 cubes into 2 parts.

  3. Show all the ways to snap a tower of 6 cubes into 2 parts.

  4. What patterns do you notice?