# 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?

How many do you see?

Record an estimate that is:

too low

about right

too high

How many do you see?

Record an estimate that is:

too low

about right

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.

## Practice Problem

## Problem 1

Circle **3** representations of 63.

6 tens and 3 tens

6 tens and 3 ones