Lesson 15 Greater Than, Less Than

- Let’s make sense of comparisons and decide if they’re true.

Warm-up Number Talk: Add or Subtract 10

Find the value of each expression mentally.

$35 + 10$
$52 + 10$
$52 - 10$
$83 - 10$

Activity 1 Which is Greater, Which is Less?

Circle the statement that is true in each pair.
Be ready to explain how you know so that others will understand.

1. $27 < 17$
2. $17 < 27$
1. $34 < 36$
2. $36 < 34$
1. $25 < 52$
2. $52 < 25$
1. $24 > 54$
2. $54 > 24$
1. $21 > 29$
2. $29 > 21$
1. $85 > 58$
2. $58 > 85$
1. $45 < 54$
2. $45 > 54$
1. $74 < 78$
2. $74 > 78$
1. $21 < 12$
2. $21 > 12$

Activity 2 True or False Comparisons

Read each statement.
Determine whether each statement is true or false.
Be ready to explain how you know so that others will understand
If you have time, rewrite each false statement to make it true.

$17 < 47$
1. True
2. False
$58 = 53$
1. True
2. False
$45 > 63$
1. True
2. False
$39 < 93$
1. True
2. False
$4 = 46$
1. True
2. False

Practice Problem

Problem 1

Decide if each statement is true or false.
Show your thinking using drawings, numbers, or words.

$35 < 29$
$72 = 27$
$81 > 77$