# 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.

is the same amount as .

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)

1. Write an equation that matches this 10-frame.

2. 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

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

2. 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.