Lesson 1 Compare, Count on, and Count Back
Let’s compare numbers and add or subtract.
Warm-up Number Talk: Count Back
Find the value of each expression mentally.
Activity 1 Notice the Difference
Problem 1
Tyler and Elena were asked to find the value of
Their work is shown.
Tyler
Elena
What do you notice? What do you wonder?
Problem 2
Locate and label 203 and 198 on the number line.
Compare using >, <, or =.
Find the value of
. Show your thinking.
Problem 3
Locate and label 673 and 680 on the number line.
Compare using >, <, or =.
Find the value of
. Show your thinking.
Problem 4
Locate and label 501 and 499 on the number line.
Find the value of
. Show your thinking.
Problem 5
Find the value of
Activity 2 What’s the Big Difference?
Problem 1
Fill in the missing numbers.
Does this number line show counting on by 10 or counting on by 100?
Problem 2
Fill in the missing numbers.
Does this number line show counting on by 10 or counting on by 100?
Problem 3
Fill in the missing numbers.
Does this number line show counting on by 10 or counting on by 100?
Problem 4
Fill in the missing numbers to show counting on by 10.
739, 749, , 769,
Explain how you can tell your numbers show counting on by 10 and not counting on by 100.
Practice Problem
Problem 1
Find the value of each difference. Show your thinking.