# Lesson 23 Two-Digit Numbers in Our World

Let’s estimate how many objects are in a group.

## Warm-up Estimation Exploration: Beans

How many beans are there?

Record an estimate that is:

too low | about right | too high |
---|---|---|

## Activity 1 Count the Objects

## Problem 1

Experiment 1: How many objects are in 2 handfuls?

Record an estimate that is:

too low

about right

too high

Now find the exact number.

## Problem 2

Experiment 2: How many objects are in 2 handfuls?

Record an estimate that is:

too low

about right

too high

Now find the exact number.

## Problem 3

Experiment 3: How many objects are in 2 handfuls?

Record an estimate that is:

too low

about right

too high

Now find the exact number.

## Activity 2 Quantities Card Sort

Estimate and sort the pictures based on the amount of items you see.

Sort into these groups.Less than 20

20 to 50

More than 50

Select 1 picture from each group. Show the number of items you think are in the picture in as many ways as you can.

Less than 20

20 to 50

More than 50