Number Line Addition & Subtraction — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which number line shows 9 - 4?
A) Start 9, jump 4 left
B) Start 4, jump 9 right
C) Start 9, jump 4 right
D) Start 4, jump 9 left
9 - 4 starts at the whole (9) and jumps 4 left to land on 5, so option A is correct.
2. Which number line shows 3 + 6?
A) Start 6, jump 3 left
B) Start 3, jump 6 right
C) Start 3, jump 6 left
D) Start 6, jump 3 right
3 + 6 begins at 3 and jumps 6 right to 9, matching option B.
3. Which number line shows 12 - 5?
A) Start 5, jump 12 left
B) Start 12, jump 5 right
C) Start 12, jump 5 left
D) Start 5, jump 12 right
12 - 5 starts at 12 and jumps 5 left to land on 7, matching option C.
4. Which number line shows 4 + 7?
A) Start 4, jump 7 left
B) Start 7, jump 4 left
C) Start 7, jump 4 right
D) Start 4, jump 7 right
4 + 7 starts at 4 and jumps 7 right to land on 11, which is option D.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A jump starts at 8 and goes 5 left. The equation is 8 - 5 = 3.
Jumping 5 left from 8 lands on 3, so 8 - 5 = 3, and the missing number is 5.
2. A jump starts at 2 and goes 9 right. The equation is 2 + 9 = 11.
Jumping 9 right from 2 lands on 11, so the missing addend is 9.
3. A jump starts at 14 and goes 6 left. The equation is 14 - 6 = 8.
Jumping 6 left from 14 lands on 8, so the answer is 8.
4. A jump starts at 5 and goes 8 right. The equation is 5 + 8 = 13.
The starting number fills the first blank, and 5 + 8 = 13 matches the described jump.
5. A jump starts at 11 and goes 3 left. The equation is 11 - 3 = 8.
Jumping 3 left from 11 lands on 8, which is the answer.