Number Lines — Answer Key
Part A: Sort the Words
Sort each word or number into the correct category box.
1. Sort each number by whether it is BEFORE or AFTER 50 on the number line.
Before 50
354918 After 50
627155 On a number line, any number less than 50 comes before it and any number greater than 50 comes after it.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. On a number line marked by tens, the tick right after 30 is 40.
Each tick is 10 apart, so one jump from 30 lands on 40.
2. The number that sits halfway between 20 and 40 is 30.
20 plus one jump of 10 gives 30, which is the middle of 20 and 40.
3. Start at 60 and take one jump of 10 to the right. You land on 70.
One hop of 10 from 60 moves to 70 on the number line.
4. Between 80 and 100 on a tens line, the tick in the middle is 90.
90 sits right between 80 and 100, one jump from each side.
5. The first tick to the right of 0 on a tens number line is 10.
Zero plus one hop of 10 lands on 10, the first tick of a tens line.
Part C: True or False?
Read each statement. Circle True or False.
1. On a number line, 45 sits to the left of 60.
True False
45 is less than 60, so it sits to the left on the number line.
2. The number 72 is to the left of 50 on a number line.
True False
72 is greater than 50, so it sits to the right of 50, not the left.
3. If you jump 10 to the right from 40, you land on 50.
True False
One jump of 10 from 40 moves you to 50 on the number line.
4. On a tens number line, 25 lands right on a tick mark.
True False
A tens line shows 20 and 30 as ticks. 25 sits between them, not on a tick.