Lesson 20 Make Two-Digit Numbers in Different Ways

    • Let’s make two-digit numbers in different ways.

Warm-up Estimation Exploration: Tens and Ones

How many do you see?

  1. Base ten diagram.

    Record an estimate that is:

    too low

    about right

    too high

  2. Base ten diagram.

    Record an estimate that is:

    too low

    about right

    too high

Activity 1 All The Ways to Make 94

How many ways can you make 94 using tens and ones?
Show your thinking using drawings, numbers, or words.

Activity 2 Mystery Bags

  1. Bag A has 2 ones and 5 tens.
    How many cubes are in Bag A?
    Show your thinking using drawings, numbers, or words.

  2. Bag B has 4 tens and 25 ones.
    How many cubes are in Bag B?
    Show your thinking using drawings, numbers, or words.

  3. Bag C has 49 cubes.
    If there are 29 ones, how many tens are in the bag?
    Show your thinking using drawings, numbers, or words.

  4. Bag D has 36 cubes.
    If there are only 2 tens, how many ones are in the bag?
    Show your thinking using drawings, numbers, or words.

  5. If you have time… Write a mystery bag problem about tens and ones.
    Switch with your partner.
    Solve.

Practice Problem

Problem 1

Show 4 different ways you can make 35 using tens and ones.