Lesson 9 Compare Numbers on the Number Line
Let’s compare numbers on the number line.
Warm-up Estimation Exploration: Hundreds
What number could this be?
Record an estimate that is:
too low
about right
too high
Record an estimate that is:
too low
about right
too high
Activity 1 Compare Comparisons
Each student compared 371 and 317, but represented their thinking in different ways.
Diego
I see 3 hundreds for each number.
317 only has 1 ten, but 371 has 7 tens.
Clare
Each has 3 hundreds.
371 has 7 tens, but 317 only has 1 ten.
Jada
I can see that 371 is farther to the right on my number line, so I know it is greater than 317.
What is the same and different about these students’ representations?
Discuss with a partner.
Try Jada’s way.
Estimate the location of 483 and 443 on the number line. Mark each number with a point. Label the point with the number it represents.
Use
, , or to compare 483 and 443.
Activity 2 Compare in Different Ways
Problem 1
Locate and label 420 and 590 on the number line.
Use
, , and to compare 420 and 590.
Problem 2
Estimate the location of 378 and 387 on the number line. Mark each number with a point. Label the point with the number it represents.
Use
, , and to compare 378 and 387.
Problem 3
Diego and Jada compared 2 numbers. Use their work to figure out what numbers they compared. Then use
, , and to compare the numbers. Which representation was most helpful to compare the numbers? Why?
Practice Problem
Problem 1
Estimate the location of 247 and 274 on the number line. Mark each number with a point. Label the point with the number it represents.
Use
, , or to compare 247 and 274. Explain your reasoning.