# Lesson 3 Addition and Subtraction with Tens

Let’s add and subtract 10.

## Warm-up How Many Do You See: Groups of 10

How many do you see?

How do you see them?

## Activity 1 How Many Tens Now?

## Problem 1

Show 1 ten.

Add a ten.

How many do you have now?Add another ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.Add another ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.Add another ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.Add another ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.Add another ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.Add another ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.Add another ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.

## Problem 2

Show 9 tens

Take away a ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.Take away another ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.Take away another ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.Take away another ten.

How many do you have now?

Show your thinking using drawings, numbers, or words.

How many do you have now?

Show your thinking using drawings, numbers, or words.

How many do you have now?

Show your thinking using drawings, numbers, or words.

How many do you have now?

Show your thinking using drawings, numbers, or words.

How many do you have now?

Show your thinking using drawings, numbers, or words.

## Activity 2 Introduce Five in a Row, Add or Subtract 10

Record your favorite round.

Show your thinking using drawings, numbers, or words.

## Activity 3 Centers: Choice Time

Choose a center.

Five in a Row

How Close?

Number Puzzles

## Practice Problem

## Problem 1

How many connecting cubes are in the picture?

Circle the picture that shows 10 more connecting cubes. Cross out the picture that shows 10 fewer connecting cubes.