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?

    Base ten diagram.

    Record an estimate that is:

    too low

    about right

    too high

  2. How many do you see?

    Base-ten drawing.

    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

Base-ten drawing. 7 tens, 3 ones.

  • Han drew

Base-ten drawing. 7 tens, each labeled 10. 3 ones. each labeled 1.

  • 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.

Base-ten drawing. 4 tens,1 one.
Forty plus one.
1 ten 4 ones.

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.

  1. Base ten diagram. 6 tens. 3 ones.
  2. Base ten diagram. 3 tens. 6 ones.

  3. 6 tens and 3 tens

  4. 6 tens and 3 ones