Number Lines — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. On a 0 to 1000 number line with jumps of 100, which tick comes right after 400?
A) 410
B) 500
C) 450
D) 600
Each jump adds 100, so the tick after 400 is 400 plus 100, which is 500 on the line.
2. Starting at 200 and making four forward jumps of 100, where do you land?
A) 500
B) 700
C) 600
D) 400
Four jumps of 100 add 400 in all, and 200 plus 400 is 600 on the number line.
3. Which tick sits halfway between 300 and 700 on a line that jumps by 100?
A) 400
B) 600
C) 550
D) 500
The gap from 300 to 700 is 400, so the midpoint is 300 plus 200, which equals 500.
4. On a 0 to 1000 line jumping by 100, how many jumps does it take to get from 100 to 900?
A) 7 jumps
B) 8 jumps
C) 9 jumps
D) 10 jumps
From 100 to 900 the gap is 800, and 800 divided into jumps of 100 is exactly 8 jumps.
Part B: Fill in the Blank
Write the correct answer on each line.
1. On a 0 to 1000 line with jumps of 100, the tick just before 800 is 700.
One backward jump of 100 from 800 lands on 700, the tick right before 800.
2. Starting at 0 and making six jumps of 100, you land on 600.
Six jumps of 100 add to 600, so you land on 600 on a number line that jumps by 100.
3. The tick right after 900 on a 0 to 1000 line jumping by 100 is 1000.
900 plus 100 is 1000, which is the final tick on a 0 to 1000 number line.
4. From 400, three backward jumps of 100 land on 100.
400 minus 100 is 300, 300 minus 100 is 200, and 200 minus 100 is 100 on the line.
5. The midpoint tick between 200 and 800 on a jump-of-100 line is 500.
The middle of 200 and 800 is halfway across a 600 gap, which is 200 plus 300, or 500.