# Lesson 20 More or Less than 10?

• Let’s decide if there are more or fewer than 10 things in a group.

## Warm-up Estimation Exploration: Close to 10

Record an estimate that is:

too low

too high

## Activity 1 Use 10 to Estimate

Write “more” or “fewer” to finish each sentence.

1. I think there are than 10 pencils.

How many pencils are there?

2. I think there are than 10 pencils.

How many pencils are there?

3. I think there are than 10 pencils.

How many pencils are there?

4. I think there are than 10 pencils.

How many pencils are there?

5. I think there are than 10 pencils.

How many pencils are there?

## Activity 2 Could She Be Right?

1. Elena says there are about 11 snowflakes.
Do you think she could be right?
Why or why not?

2. Elena says there are about 8 flowers.
Do you think she could be right?
Why or why not?

3. Elena says there are about 11 suns.
Do you think she could be right?
Why or why not?

## Activity 3 Centers: Choice Time

Choose a center.

Shake and Spill

Number Race

Grab and Count

What’s Behind My Back?

Pattern Blocks