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Math Grade K-1 Answer Key

Adding and Subtracting on a Number Line 0 to 10

Use hops to add and subtract within 10

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Adding and Subtracting on a Number Line 0 to 10

Use hops to add and subtract within 10

Math - Grade K-1

Instructions: Read each problem carefully. Use the number line to count hops forward for addition and hops backward for subtraction. Show your work in the space provided.
  1. 1

    Start at 2. Hop forward 3 spaces. What number do you land on? Write the addition sentence.

    For addition, hop to the right on the number line.

    You land on 5. The addition sentence is 2 + 3 = 5.
  2. 2

    Start at 7. Hop backward 2 spaces. What number do you land on? Write the subtraction sentence.

    For subtraction, hop to the left on the number line.

    You land on 5. The subtraction sentence is 7 - 2 = 5.
  3. 3

    Use a number line to solve 4 + 2.

    The sum is 6 because 2 hops forward from 4 lands on 6.
  4. 4

    Use a number line to solve 9 - 4.

    Count one number for each hop back.

    The difference is 5 because 4 hops backward from 9 lands on 5.
  5. 5

    Mia starts at 1 on the number line and hops forward to 6. How many hops did Mia make? Write the missing number: 1 + __ = 6.

    Mia made 5 hops. The missing number is 5, so 1 + 5 = 6.
  6. 6

    Sam starts at 8 on the number line and hops backward to 3. How many hops did Sam make? Write the missing number: 8 - __ = 3.

    Count the hops from 8 down to 3.

    Sam made 5 hops. The missing number is 5, so 8 - 5 = 3.
  7. 7

    Circle the equation that matches the hops: Start at 3 and hop forward 4 spaces. 3 + 4 = 7 or 3 - 4 = 1.

    The matching equation is 3 + 4 = 7 because hopping forward means adding.
  8. 8

    Use a number line to solve 6 - 1.

    One hop back means move to the number just before 6.

    The difference is 5 because 1 hop backward from 6 lands on 5.
  9. 9

    Start at 0. Hop forward 5 spaces. What number do you land on?

    You land on 5 because 5 hops forward from 0 ends at 5.
  10. 10

    Start at 10. Hop backward 3 spaces. What number do you land on? Write the subtraction sentence.

    Start at 10 and count back 3 numbers.

    You land on 7. The subtraction sentence is 10 - 3 = 7.
  11. 11

    Use a number line to solve 5 + 4.

    Check that you do not hop past 10.

    The sum is 9 because 4 hops forward from 5 lands on 9.
  12. 12

    Use a number line to solve 7 - 7.

    The difference is 0 because 7 hops backward from 7 lands on 0.
  13. 13

    Lena is on 4. She hops forward 1 space, then forward 2 more spaces. What number is she on now?

    Do the hops in order.

    Lena is on 7 because 4 + 1 = 5 and 5 + 2 = 7.
  14. 14

    Noah is on 9. He hops backward 2 spaces, then backward 1 more space. What number is he on now?

    Noah is on 6 because 9 - 2 = 7 and 7 - 1 = 6.
  15. 15

    Fill in the missing number: 2 + __ = 10. Use hops on a number line to help.

    Count the spaces from 2 to 10.

    The missing number is 8 because it takes 8 hops forward to go from 2 to 10.
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