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Number Line Subtraction Practice

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Number Line Subtraction Practice

Use backward jumps on a number line to subtract. You can split a subtraction into smaller jumps, and check your results with addition.

Subtract with backward jumps

1.Start at 21 and make 6 backward jumps of 1. Where do you land?

2.Work out 32 − 9. Show how you can split 9 into two backward jumps.

3.Subtract 17 from 54 by jumping back 10 first, then 7. Record both landing numbers and the final answer.

4.Use the number line to calculate 8.6 − 3.4. Show your backward jumps.

Use addition to check subtraction

5.Complete this related-facts set: 14 − 6 = 8. Fill in 8 + 6 = __; 14 − 8 = __; 6 + 8 = __.

6.Check each subtraction using addition. Write the total for the check and say whether the subtraction is correct: (a) 27 − 8 = 19; check 19 + 8. (b) 46 − 29 = 18; check 18 + 29. (c) 70 − 34 = 36; check 36 + 34.

7.Jarrah has $35.00 and spends $12.65 on a book. How much money does she have left? Write a subtraction and an addition check.

Estimate and solve

8.Estimate 86 − 37 by rounding both numbers to the nearest ten. Then calculate the exact difference and explain briefly why your estimate is reasonable.

9.At dawn the temperature was 4°C. By lunchtime it was −3°C. What was the change in temperature? Use the number line to show the movement.