Time & moneyAges 10-12

Working backwards from finish time

Count backwards in minutes from an activity’s finish time to find when it started. Review suitability for your learners before teaching.

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Age band:Ages 7-9 Ages 10-12

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Worksheet StudioPractice pack · Ages 10-12

Working backwards from finish time

Take your time. Show your thinking.

1. A countdown timer shows 9 minutes and 20 seconds remaining. How many seconds is that in total?
9 m · 20 s · Working backwards from fin…
2. A countdown timer shows 9 minutes and 50 seconds remaining. How many seconds is that in total?
9 m · 50 s · Working backwards from fin…
3. A countdown timer shows 3 minutes and 50 seconds remaining. How many seconds is that in total?
3 m · 50 s · Working backwards from fin…
4. A countdown timer shows 5 minutes and 55 seconds remaining. How many seconds is that in total?
5 m · 55 s · Working backwards from fin…
5. A countdown timer shows 12 minutes and 50 seconds remaining. How many seconds is that in total?
12 m · 50 s · Working backwards from fin…
6. A countdown timer shows 8 minutes and 35 seconds remaining. How many seconds is that in total?
8 m · 35 s · Working backwards from fin…
7. A countdown timer shows 5 minutes and 40 seconds remaining. How many seconds is that in total?
5 m · 40 s · Working backwards from fin…
8. A countdown timer shows 5 minutes and 30 seconds remaining. How many seconds is that in total?
5 m · 30 s · Working backwards from fin…
9. A countdown timer shows 3 minutes and 15 seconds remaining. How many seconds is that in total?
3 m · 15 s · Working backwards from fin…
10. A countdown timer shows 8 minutes and 40 seconds remaining. How many seconds is that in total?
8 m · 40 s · Working backwards from fin…
11. A countdown timer shows 12 minutes and 40 seconds remaining. How many seconds is that in total?
12 m · 40 s · Working backwards from fin…
12. A countdown timer shows 9 minutes and 30 seconds remaining. How many seconds is that in total?
9 m · 30 s · Working backwards from fin…

12 questions · Seed 43 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 10-12

Working backwards from finish time

Answers and reasoning. Review before teaching.

1. A countdown timer shows 9 minutes and 20 seconds remaining. How many seconds is that in total?
560 seconds
9 × 60 = 540 seconds, plus 20 seconds = 560 seconds.
2. A countdown timer shows 9 minutes and 50 seconds remaining. How many seconds is that in total?
590 seconds
9 × 60 = 540 seconds, plus 50 seconds = 590 seconds.
3. A countdown timer shows 3 minutes and 50 seconds remaining. How many seconds is that in total?
230 seconds
3 × 60 = 180 seconds, plus 50 seconds = 230 seconds.
4. A countdown timer shows 5 minutes and 55 seconds remaining. How many seconds is that in total?
355 seconds
5 × 60 = 300 seconds, plus 55 seconds = 355 seconds.
5. A countdown timer shows 12 minutes and 50 seconds remaining. How many seconds is that in total?
770 seconds
12 × 60 = 720 seconds, plus 50 seconds = 770 seconds.
6. A countdown timer shows 8 minutes and 35 seconds remaining. How many seconds is that in total?
515 seconds
8 × 60 = 480 seconds, plus 35 seconds = 515 seconds.
7. A countdown timer shows 5 minutes and 40 seconds remaining. How many seconds is that in total?
340 seconds
5 × 60 = 300 seconds, plus 40 seconds = 340 seconds.
8. A countdown timer shows 5 minutes and 30 seconds remaining. How many seconds is that in total?
330 seconds
5 × 60 = 300 seconds, plus 30 seconds = 330 seconds.
9. A countdown timer shows 3 minutes and 15 seconds remaining. How many seconds is that in total?
195 seconds
3 × 60 = 180 seconds, plus 15 seconds = 195 seconds.
10. A countdown timer shows 8 minutes and 40 seconds remaining. How many seconds is that in total?
520 seconds
8 × 60 = 480 seconds, plus 40 seconds = 520 seconds.
11. A countdown timer shows 12 minutes and 40 seconds remaining. How many seconds is that in total?
760 seconds
12 × 60 = 720 seconds, plus 40 seconds = 760 seconds.
12. A countdown timer shows 9 minutes and 30 seconds remaining. How many seconds is that in total?
570 seconds
9 × 60 = 540 seconds, plus 30 seconds = 570 seconds.

12 questions · Seed 43 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 10-12

Working backwards from finish time

Take your time. Show your thinking.

1. A countdown timer shows 9 minutes and 20 seconds remaining. How many seconds is that in total?
9 m · 20 s · Working backwards from fin…
2. A countdown timer shows 9 minutes and 50 seconds remaining. How many seconds is that in total?
9 m · 50 s · Working backwards from fin…
3. A countdown timer shows 3 minutes and 50 seconds remaining. How many seconds is that in total?
3 m · 50 s · Working backwards from fin…
4. A countdown timer shows 5 minutes and 55 seconds remaining. How many seconds is that in total?
5 m · 55 s · Working backwards from fin…
5. A countdown timer shows 12 minutes and 50 seconds remaining. How many seconds is that in total?
12 m · 50 s · Working backwards from fin…
6. A countdown timer shows 8 minutes and 35 seconds remaining. How many seconds is that in total?
8 m · 35 s · Working backwards from fin…
7. A countdown timer shows 5 minutes and 40 seconds remaining. How many seconds is that in total?
5 m · 40 s · Working backwards from fin…
8. A countdown timer shows 5 minutes and 30 seconds remaining. How many seconds is that in total?
5 m · 30 s · Working backwards from fin…
9. A countdown timer shows 3 minutes and 15 seconds remaining. How many seconds is that in total?
3 m · 15 s · Working backwards from fin…
10. A countdown timer shows 8 minutes and 40 seconds remaining. How many seconds is that in total?
8 m · 40 s · Working backwards from fin…
11. A countdown timer shows 12 minutes and 40 seconds remaining. How many seconds is that in total?
12 m · 40 s · Working backwards from fin…
12. A countdown timer shows 9 minutes and 30 seconds remaining. How many seconds is that in total?
9 m · 30 s · Working backwards from fin…

12 questions · Seed 43 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 10-12

Working backwards from finish time

Answers and reasoning. Review before teaching.

1. A countdown timer shows 9 minutes and 20 seconds remaining. How many seconds is that in total?
560 seconds
9 × 60 = 540 seconds, plus 20 seconds = 560 seconds.
2. A countdown timer shows 9 minutes and 50 seconds remaining. How many seconds is that in total?
590 seconds
9 × 60 = 540 seconds, plus 50 seconds = 590 seconds.
3. A countdown timer shows 3 minutes and 50 seconds remaining. How many seconds is that in total?
230 seconds
3 × 60 = 180 seconds, plus 50 seconds = 230 seconds.
4. A countdown timer shows 5 minutes and 55 seconds remaining. How many seconds is that in total?
355 seconds
5 × 60 = 300 seconds, plus 55 seconds = 355 seconds.
5. A countdown timer shows 12 minutes and 50 seconds remaining. How many seconds is that in total?
770 seconds
12 × 60 = 720 seconds, plus 50 seconds = 770 seconds.
6. A countdown timer shows 8 minutes and 35 seconds remaining. How many seconds is that in total?
515 seconds
8 × 60 = 480 seconds, plus 35 seconds = 515 seconds.
7. A countdown timer shows 5 minutes and 40 seconds remaining. How many seconds is that in total?
340 seconds
5 × 60 = 300 seconds, plus 40 seconds = 340 seconds.
8. A countdown timer shows 5 minutes and 30 seconds remaining. How many seconds is that in total?
330 seconds
5 × 60 = 300 seconds, plus 30 seconds = 330 seconds.
9. A countdown timer shows 3 minutes and 15 seconds remaining. How many seconds is that in total?
195 seconds
3 × 60 = 180 seconds, plus 15 seconds = 195 seconds.
10. A countdown timer shows 8 minutes and 40 seconds remaining. How many seconds is that in total?
520 seconds
8 × 60 = 480 seconds, plus 40 seconds = 520 seconds.
11. A countdown timer shows 12 minutes and 40 seconds remaining. How many seconds is that in total?
760 seconds
12 × 60 = 720 seconds, plus 40 seconds = 760 seconds.
12. A countdown timer shows 9 minutes and 30 seconds remaining. How many seconds is that in total?
570 seconds
9 × 60 = 540 seconds, plus 30 seconds = 570 seconds.

12 questions · Seed 43 · Age guidance, not curriculum certification