Lesson 1 How Do We Compose a Hundred?

    • Let’s compose a hundred.

    Number 100 shown in digits, base-ten blocks, and words.

Warm-up Choral Count: Count Beyond 100

Count by 1, starting at 90.
What patterns do you see?

Activity 1 How Do We Make a Hundred?

Problem 1

How many do you see? How do you see them?

Base ten blocks. 8 tens, 16 ones.

Problem 2

Andre added more blocks.

Base ten blocks. 8 tens, 20 ones.
  1. What is the value of Andre’s blocks now?

  2. How many tens and ones are in this number?

Problem 3

Andre made the same number with the fewest amount of blocks possible. Draw a base-ten diagram to show what Andre’s number looks like now. Use your base-ten blocks to help.

Activity 2 Different Ways to See 100

Three students were looking at 100 small squares arranged like this:

  1. Match the diagrams to the statements. Label each diagram with 1, 2, or 3. Be prepared to explain your matches.

    1. Priya said, “I see 100 ones.”

    2. Kiran said, “I see 10 tens.”

    3. Lin said, “I see 1 hundred.”

    Base ten diagram.
    Base ten diagram.
    Base-ten diagram. 1 hundred.

  2. Represent with blocks or a diagram.

Practice Problem

Problem 1

Explain how you see each of these in the picture.

  1. 100 ones

  2. 10 tens

  3. 1 hundred