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Find the amount after some time

Grade 8 math · Fieldbook Learning

Name ______________________ Date __________

Start with the initial amount and add or subtract the rate once for each time period.

  1. A pool holds 9 L of water and a hose adds 4 L every minute. How many L are there after 6 minutes?
  2. A hiker is 19 km from camp and walks toward it at 4 km every hour. How many km are there after 7 hours?
  3. A pool holds 16 L of water and a hose adds 6 L every minute. How many L are there after 6 minutes?
  4. A jar holds 47 coins and 9 more coins are added each week. How many coins are there after 6 weeks?
  5. A jar holds 13 coins and 5 more coins are added each week. How many coins are there after 6 weeks?
  6. A hiker is 10 km from camp and walks toward it at 9 km every hour. How many km are there after 4 hours?
  7. A pool holds 65 L of water and a hose adds 7 L every minute. How many L are there after 5 minutes?
  8. A candle is 16 cm tall and burns down 5 cm every hour. How many cm are there after 3 hours?
  9. A hiker is 93 km from camp and walks toward it at 8 km every hour. How many km are there after 12 hours?
  10. A hiker is 57 km from camp and walks toward it at 2 km every hour. How many km are there after 5 hours?
  11. A hiker is 64 km from camp and walks toward it at 2 km every hour. How many km are there after 10 hours?
  12. A hiker is 95 km from camp and walks toward it at 6 km every hour. How many km are there after 2 hours?
  13. A candle is 53 cm tall and burns down 9 cm every hour. How many cm are there after 10 hours?
  14. A hiker is 33 km from camp and walks toward it at 6 km every hour. How many km are there after 3 hours?
  15. A pool holds 48 L of water and a hose adds 8 L every minute. How many L are there after 4 minutes?
  16. A hiker is 113 km from camp and walks toward it at 5 km every hour. How many km are there after 3 hours?
  17. A candle is 141 cm tall and burns down 4 cm every hour. How many cm are there after 17 hours?
  18. A candle is 171 cm tall and burns down 6 cm every hour. How many cm are there after 5 hours?
  19. A candle is 133 cm tall and burns down 5 cm every hour. How many cm are there after 19 hours?
  20. A candle is 63 cm tall and burns down 2 cm every hour. How many cm are there after 6 hours?
More free practice: fieldbooklearning.com/practice/grade-8/find-the-amount-after-some-time/

Play it as a quiz game

16 of these questions as multiple choice, with near-miss wrong answers, ready for Kahoot or Blooket.

  1. Download the game's own question template: in Kahoot, Add question → Import spreadsheet; in Blooket, Create a set → Spreadsheet import.
  2. Click the matching button below, then click the first empty question row of the template and paste.
  3. Save the template (Kahoot needs .xlsx, Blooket .csv) and upload it.
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Answer key: Find the amount after some time

  1. 33
  2. -9
  3. 52
  4. 101
  5. 43
  6. -26
  7. 100
  8. 1
  9. -3
  10. 47
  11. 44
  12. 83
  13. -37
  14. 15
  15. 80
  16. 98
  17. 73
  18. 141
  19. 38
  20. 51