# 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.

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)

How can you break apart 3 connecting cubes into 2 parts?

Show your thinking using drawings, numbers, words, or objects.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.

How many pattern blocks did Jada use?

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.

Write an expression for Mai’s connecting cubes.

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.

He wrote the expression

What pattern blocks did Han use?

## Problem 5 (Exploration)

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

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

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

What patterns do you notice?