# Lesson 8 Different Representations of Tens and Ones

• Let’s think about how two-digit numbers can be shown.

## Warm-up Estimation Exploration: How Many?

1. How many do you see?

Record an estimate that is:

too low

too high

2. How many do you see?

Record an estimate that is:

too low

too high

## Activity 1 Compare Representations of a Collection

Each student counted and showed a collection.

• Clare drew

• Han drew

• Kiran wrote 3 ones and 7 tens.

• Priya wrote .

Did the students count the same number of objects?
How do you know?
Show your thinking using drawings, numbers, or words.

## Activity 2 Card Sort: Base-ten Representations

Your teacher will give you a set of cards that show different representations of a two-digit number. Find the cards that match. Be ready to explain your reasoning.

## Activity 3 Introduce Grab and Count: Ones Cubes

We are going to learn a new center called Grab and Count.

## Problem 1

Circle 3 representations of 63.

1. 6 tens and 3 tens

2. 6 tens and 3 ones