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 15 minutes and 15 seconds remaining. How many seconds is that in total?
15 m · 15 s · Working backwards from fin…
2. A countdown timer shows 12 minutes and 35 seconds remaining. How many seconds is that in total?
12 m · 35 s · Working backwards from fin…
3. A countdown timer shows 8 minutes and 55 seconds remaining. How many seconds is that in total?
8 m · 55 s · Working backwards from fin…
4. A countdown timer shows 14 minutes and 30 seconds remaining. How many seconds is that in total?
14 m · 30 s · Working backwards from fin…
5. A countdown timer shows 2 minutes and 15 seconds remaining. How many seconds is that in total?
2 m · 15 s · Working backwards from fin…
6. A countdown timer shows 11 minutes and 50 seconds remaining. How many seconds is that in total?
11 m · 50 s · Working backwards from fin…
7. A countdown timer shows 7 minutes and 20 seconds remaining. How many seconds is that in total?
7 m · 20 s · Working backwards from fin…
8. A countdown timer shows 3 minutes and 20 seconds remaining. How many seconds is that in total?
3 m · 20 s · Working backwards from fin…
9. A countdown timer shows 1 minute and 30 seconds remaining. How many seconds is that in total?
1 m · 30 s · Working backwards from fin…
10. A countdown timer shows 8 minutes and 20 seconds remaining. How many seconds is that in total?
8 m · 20 s · Working backwards from fin…
11. A countdown timer shows 7 minutes and 30 seconds remaining. How many seconds is that in total?
7 m · 30 s · Working backwards from fin…
12. A countdown timer shows 9 minutes and 25 seconds remaining. How many seconds is that in total?
9 m · 25 s · Working backwards from fin…

12 questions · Seed 104747 · 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 15 minutes and 15 seconds remaining. How many seconds is that in total?
915 seconds
15 × 60 = 900 seconds, plus 15 seconds = 915 seconds.
2. A countdown timer shows 12 minutes and 35 seconds remaining. How many seconds is that in total?
755 seconds
12 × 60 = 720 seconds, plus 35 seconds = 755 seconds.
3. A countdown timer shows 8 minutes and 55 seconds remaining. How many seconds is that in total?
535 seconds
8 × 60 = 480 seconds, plus 55 seconds = 535 seconds.
4. A countdown timer shows 14 minutes and 30 seconds remaining. How many seconds is that in total?
870 seconds
14 × 60 = 840 seconds, plus 30 seconds = 870 seconds.
5. A countdown timer shows 2 minutes and 15 seconds remaining. How many seconds is that in total?
135 seconds
2 × 60 = 120 seconds, plus 15 seconds = 135 seconds.
6. A countdown timer shows 11 minutes and 50 seconds remaining. How many seconds is that in total?
710 seconds
11 × 60 = 660 seconds, plus 50 seconds = 710 seconds.
7. A countdown timer shows 7 minutes and 20 seconds remaining. How many seconds is that in total?
440 seconds
7 × 60 = 420 seconds, plus 20 seconds = 440 seconds.
8. A countdown timer shows 3 minutes and 20 seconds remaining. How many seconds is that in total?
200 seconds
3 × 60 = 180 seconds, plus 20 seconds = 200 seconds.
9. A countdown timer shows 1 minute and 30 seconds remaining. How many seconds is that in total?
90 seconds
1 × 60 = 60 seconds, plus 30 seconds = 90 seconds.
10. A countdown timer shows 8 minutes and 20 seconds remaining. How many seconds is that in total?
500 seconds
8 × 60 = 480 seconds, plus 20 seconds = 500 seconds.
11. A countdown timer shows 7 minutes and 30 seconds remaining. How many seconds is that in total?
450 seconds
7 × 60 = 420 seconds, plus 30 seconds = 450 seconds.
12. A countdown timer shows 9 minutes and 25 seconds remaining. How many seconds is that in total?
565 seconds
9 × 60 = 540 seconds, plus 25 seconds = 565 seconds.

12 questions · Seed 104747 · 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 15 minutes and 15 seconds remaining. How many seconds is that in total?
15 m · 15 s · Working backwards from fin…
2. A countdown timer shows 12 minutes and 35 seconds remaining. How many seconds is that in total?
12 m · 35 s · Working backwards from fin…
3. A countdown timer shows 8 minutes and 55 seconds remaining. How many seconds is that in total?
8 m · 55 s · Working backwards from fin…
4. A countdown timer shows 14 minutes and 30 seconds remaining. How many seconds is that in total?
14 m · 30 s · Working backwards from fin…
5. A countdown timer shows 2 minutes and 15 seconds remaining. How many seconds is that in total?
2 m · 15 s · Working backwards from fin…
6. A countdown timer shows 11 minutes and 50 seconds remaining. How many seconds is that in total?
11 m · 50 s · Working backwards from fin…
7. A countdown timer shows 7 minutes and 20 seconds remaining. How many seconds is that in total?
7 m · 20 s · Working backwards from fin…
8. A countdown timer shows 3 minutes and 20 seconds remaining. How many seconds is that in total?
3 m · 20 s · Working backwards from fin…
9. A countdown timer shows 1 minute and 30 seconds remaining. How many seconds is that in total?
1 m · 30 s · Working backwards from fin…
10. A countdown timer shows 8 minutes and 20 seconds remaining. How many seconds is that in total?
8 m · 20 s · Working backwards from fin…
11. A countdown timer shows 7 minutes and 30 seconds remaining. How many seconds is that in total?
7 m · 30 s · Working backwards from fin…
12. A countdown timer shows 9 minutes and 25 seconds remaining. How many seconds is that in total?
9 m · 25 s · Working backwards from fin…

12 questions · Seed 104747 · 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 15 minutes and 15 seconds remaining. How many seconds is that in total?
915 seconds
15 × 60 = 900 seconds, plus 15 seconds = 915 seconds.
2. A countdown timer shows 12 minutes and 35 seconds remaining. How many seconds is that in total?
755 seconds
12 × 60 = 720 seconds, plus 35 seconds = 755 seconds.
3. A countdown timer shows 8 minutes and 55 seconds remaining. How many seconds is that in total?
535 seconds
8 × 60 = 480 seconds, plus 55 seconds = 535 seconds.
4. A countdown timer shows 14 minutes and 30 seconds remaining. How many seconds is that in total?
870 seconds
14 × 60 = 840 seconds, plus 30 seconds = 870 seconds.
5. A countdown timer shows 2 minutes and 15 seconds remaining. How many seconds is that in total?
135 seconds
2 × 60 = 120 seconds, plus 15 seconds = 135 seconds.
6. A countdown timer shows 11 minutes and 50 seconds remaining. How many seconds is that in total?
710 seconds
11 × 60 = 660 seconds, plus 50 seconds = 710 seconds.
7. A countdown timer shows 7 minutes and 20 seconds remaining. How many seconds is that in total?
440 seconds
7 × 60 = 420 seconds, plus 20 seconds = 440 seconds.
8. A countdown timer shows 3 minutes and 20 seconds remaining. How many seconds is that in total?
200 seconds
3 × 60 = 180 seconds, plus 20 seconds = 200 seconds.
9. A countdown timer shows 1 minute and 30 seconds remaining. How many seconds is that in total?
90 seconds
1 × 60 = 60 seconds, plus 30 seconds = 90 seconds.
10. A countdown timer shows 8 minutes and 20 seconds remaining. How many seconds is that in total?
500 seconds
8 × 60 = 480 seconds, plus 20 seconds = 500 seconds.
11. A countdown timer shows 7 minutes and 30 seconds remaining. How many seconds is that in total?
450 seconds
7 × 60 = 420 seconds, plus 30 seconds = 450 seconds.
12. A countdown timer shows 9 minutes and 25 seconds remaining. How many seconds is that in total?
565 seconds
9 × 60 = 540 seconds, plus 25 seconds = 565 seconds.

12 questions · Seed 104747 · Age guidance, not curriculum certification