# 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 | about right | too high |
---|---|---|

## Activity 1 Use 10 to Estimate

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

I think there are than 10 pencils.

How many pencils are there?

I think there are than 10 pencils.

How many pencils are there?

I think there are than 10 pencils.

How many pencils are there?

I think there are than 10 pencils.

How many pencils are there?

I think there are than 10 pencils.

How many pencils are there?

## Activity 2 Could She Be Right?

Elena says there are about 11 snowflakes.

Do you think she could be right?

Why or why not?Elena says there are about 8 flowers.

Do you think she could be right?

Why or why not?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