Lesson 18 Compare and Order Numbers

    • Let’s compare and order numbers.

Warm-up Which One Doesn’t Belong: Comparison Statements

Which one doesn’t belong?

  1. Comparison statement. 5, less than symbol, 30.
  2. Comparison statement. 25, less than symbol, 35.
  3. Comparison statement. 35, less than symbol, 20.
  4. Comparison statement. 30, greater than symbol, 20.

Activity 1 Compare and Order Quantities

Number, 51.
5 ones. 1 ten.
Base ten diagram. 3 ones. 3 tens.
Base-ten diagram. 5 tens. 3 ones.

Pick a set of cards.
Put the cards in order from least to greatest.
Be ready to explain how you ordered your cards.

If you have time:
Mix two sets of cards together.
Put them in order from least to greatest.

Students in a group with number cards.

Set A:

Set B:

Set C:

Set D:

Activity 2 Order Numbers

Here are some numbers in order:

1

5

10

50

99

Problem 1

Add these numbers to the list:

  • 49

  • 8

  • 25

  • 98

  • 13

Make sure all the numbers are in order from least to greatest.

Problem 2

Choose 2 numbers. Explain how you knew where to place them.

  1. I knew where to place because

  2. I knew where to place because

Problem 3

Write a number that makes each comparison statement true.

Practice Problem

Problem 1

Order the numbers from least to greatest:

  1. 73

  2. 16

  3. 84

  4. 9

  5. 87

  6. 75

  7. 33