# Section A: Practice Problems Develop Fluency with Addition and Subtraction within 10

## Section Summary

## Details

We practiced adding within 10.

We counted on.

We added in any order.

We learned that when expressions have the same value, you can show that with an equal sign.

We learned that we can use addition to find the difference between 2 numbers.

Since I know 6 + 4 = 10, then I know 10 - 6 = 4.

## Problem 1 (Pre-Unit)

For each picture, write a number for how many you see.

## Problem 2 (Pre-Unit)

Match each picture with an expression.

## Problem 3 (Pre-Unit)

There were 5 monkeys swinging in the tree.

Then 2 more monkeys came to join them.

How many monkeys are in the tree now?

Show your thinking using drawings, numbers, or words.

## Problem 4 (Lesson 1)

Find the value of each sum.

## Problem 5 (Lesson 2)

Find the value of each sum.

## Problem 6 (Lesson 3)

Select **3** true equations.

## Problem 7 (Lesson 4)

Write an equation that matches this 10-frame.

Write 2 equations that show other ways to make 10.

## Problem 8 (Lesson 5)

Find the value of each expression.

Show your thinking using drawings, numbers, or words.

## Problem 9 (Lesson 6)

There are some counters in the cup.

Lin puts in 5 more counters.

Now there are 9 counters in the cup.

How many counters were in the cup before Lin added more?

Show your thinking using drawings, numbers, or words.

## Problem 10 (Exploration)

Here are some numbers:

1

2

4

5

7

Can you make 10 using

**2**of the numbers? Show your thinking using drawings, numbers, or words.Can you make 10 using

**3**of the numbers? Show your thinking using drawings, numbers, or words.

## Problem 11 (Exploration)

Find the number that makes each equation true.

Show your thinking using drawings, numbers, or words.