Number Lines — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Starting at 50 and jumping back by 10, you land on 40.
One backward jump of 10 from 50 subtracts 10, landing you at 40 on the number line.
2. Starting at 30 and jumping back by 5, you land on 25.
A backward jump of 5 from 30 lands on 25, five steps to the left on the line.
3. Starting at 100 and taking two backward jumps of 10, you land on 80.
100 minus 10 is 90, and 90 minus 10 is 80, so two backward jumps of 10 land on 80.
4. Starting at 18 and jumping back by 2, you land on 16.
One backward jump of 2 from 18 subtracts 2, taking you to 16 on the number line.
5. A line starting at 60 and jumping back by 10 shows 60, 50, 40, and 30.
Each tick goes down by 10, so after 40 the next backward tick is 30.
6. Starting at 45 and jumping back by 5, you land on 40.
45 minus a backward jump of 5 lands on 40 on the number line.
7. A line starts at 25 and jumps back by 5 three times; you end at 10.
25 minus 5 is 20, 20 minus 5 is 15, and 15 minus 5 is 10, so you end at 10.
8. Starting at 70 and jumping back by 10 twice lands you at 50.
Two backward jumps of 10 subtract 20 from 70, so you land on 50 on the line.
9. A reversed line that starts at 20 on the right and jumps left by 5 shows 20, 15, 10, and 5.
The pattern decreases by 5 each tick, so the next value after 10 is 5.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Start at 40, jump back 10
→ Lands on 30
Lands on 20
Start at 25, jump back 5
→ Lands on 20
Lands on 12
Start at 100, jump back 10
→ Lands on 90
Lands on 90
Start at 14, jump back 2
→ Lands on 12
Lands on 30
40 minus 10 is 30, 25 minus 5 is 20, 100 minus 10 is 90, and 14 minus 2 is 12 on the line.