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 55 seconds remaining. How many seconds is that in total?
9 m · 55 s · Working backwards from fin…
2. A countdown timer shows 10 minutes and 20 seconds remaining. How many seconds is that in total?
10 m · 20 s · Working backwards from fin…
3. A countdown timer shows 7 minutes and 35 seconds remaining. How many seconds is that in total?
7 m · 35 s · Working backwards from fin…
4. A countdown timer shows 4 minutes and 35 seconds remaining. How many seconds is that in total?
4 m · 35 s · Working backwards from fin…
5. A countdown timer shows 3 minutes and 5 seconds remaining. How many seconds is that in total?
3 m · 5 s · Working backwards from fin…
6. A countdown timer shows 2 minutes and 50 seconds remaining. How many seconds is that in total?
2 m · 50 s · Working backwards from fin…
7. A countdown timer shows 3 minutes and 45 seconds remaining. How many seconds is that in total?
3 m · 45 s · Working backwards from fin…
8. A countdown timer shows 5 minutes and 35 seconds remaining. How many seconds is that in total?
5 m · 35 s · Working backwards from fin…
9. A countdown timer shows 10 minutes and 10 seconds remaining. How many seconds is that in total?
10 m · 10 s · Working backwards from fin…
10. 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…
11. A countdown timer shows 13 minutes and 5 seconds remaining. How many seconds is that in total?
13 m · 5 s · Working backwards from fin…
12. 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…

12 questions · Seed 50 · 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 55 seconds remaining. How many seconds is that in total?
595 seconds
9 × 60 = 540 seconds, plus 55 seconds = 595 seconds.
2. A countdown timer shows 10 minutes and 20 seconds remaining. How many seconds is that in total?
620 seconds
10 × 60 = 600 seconds, plus 20 seconds = 620 seconds.
3. A countdown timer shows 7 minutes and 35 seconds remaining. How many seconds is that in total?
455 seconds
7 × 60 = 420 seconds, plus 35 seconds = 455 seconds.
4. A countdown timer shows 4 minutes and 35 seconds remaining. How many seconds is that in total?
275 seconds
4 × 60 = 240 seconds, plus 35 seconds = 275 seconds.
5. A countdown timer shows 3 minutes and 5 seconds remaining. How many seconds is that in total?
185 seconds
3 × 60 = 180 seconds, plus 5 seconds = 185 seconds.
6. A countdown timer shows 2 minutes and 50 seconds remaining. How many seconds is that in total?
170 seconds
2 × 60 = 120 seconds, plus 50 seconds = 170 seconds.
7. A countdown timer shows 3 minutes and 45 seconds remaining. How many seconds is that in total?
225 seconds
3 × 60 = 180 seconds, plus 45 seconds = 225 seconds.
8. A countdown timer shows 5 minutes and 35 seconds remaining. How many seconds is that in total?
335 seconds
5 × 60 = 300 seconds, plus 35 seconds = 335 seconds.
9. A countdown timer shows 10 minutes and 10 seconds remaining. How many seconds is that in total?
610 seconds
10 × 60 = 600 seconds, plus 10 seconds = 610 seconds.
10. 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.
11. A countdown timer shows 13 minutes and 5 seconds remaining. How many seconds is that in total?
785 seconds
13 × 60 = 780 seconds, plus 5 seconds = 785 seconds.
12. 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.

12 questions · Seed 50 · 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 55 seconds remaining. How many seconds is that in total?
9 m · 55 s · Working backwards from fin…
2. A countdown timer shows 10 minutes and 20 seconds remaining. How many seconds is that in total?
10 m · 20 s · Working backwards from fin…
3. A countdown timer shows 7 minutes and 35 seconds remaining. How many seconds is that in total?
7 m · 35 s · Working backwards from fin…
4. A countdown timer shows 4 minutes and 35 seconds remaining. How many seconds is that in total?
4 m · 35 s · Working backwards from fin…
5. A countdown timer shows 3 minutes and 5 seconds remaining. How many seconds is that in total?
3 m · 5 s · Working backwards from fin…
6. A countdown timer shows 2 minutes and 50 seconds remaining. How many seconds is that in total?
2 m · 50 s · Working backwards from fin…
7. A countdown timer shows 3 minutes and 45 seconds remaining. How many seconds is that in total?
3 m · 45 s · Working backwards from fin…
8. A countdown timer shows 5 minutes and 35 seconds remaining. How many seconds is that in total?
5 m · 35 s · Working backwards from fin…
9. A countdown timer shows 10 minutes and 10 seconds remaining. How many seconds is that in total?
10 m · 10 s · Working backwards from fin…
10. 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…
11. A countdown timer shows 13 minutes and 5 seconds remaining. How many seconds is that in total?
13 m · 5 s · Working backwards from fin…
12. 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…

12 questions · Seed 50 · 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 55 seconds remaining. How many seconds is that in total?
595 seconds
9 × 60 = 540 seconds, plus 55 seconds = 595 seconds.
2. A countdown timer shows 10 minutes and 20 seconds remaining. How many seconds is that in total?
620 seconds
10 × 60 = 600 seconds, plus 20 seconds = 620 seconds.
3. A countdown timer shows 7 minutes and 35 seconds remaining. How many seconds is that in total?
455 seconds
7 × 60 = 420 seconds, plus 35 seconds = 455 seconds.
4. A countdown timer shows 4 minutes and 35 seconds remaining. How many seconds is that in total?
275 seconds
4 × 60 = 240 seconds, plus 35 seconds = 275 seconds.
5. A countdown timer shows 3 minutes and 5 seconds remaining. How many seconds is that in total?
185 seconds
3 × 60 = 180 seconds, plus 5 seconds = 185 seconds.
6. A countdown timer shows 2 minutes and 50 seconds remaining. How many seconds is that in total?
170 seconds
2 × 60 = 120 seconds, plus 50 seconds = 170 seconds.
7. A countdown timer shows 3 minutes and 45 seconds remaining. How many seconds is that in total?
225 seconds
3 × 60 = 180 seconds, plus 45 seconds = 225 seconds.
8. A countdown timer shows 5 minutes and 35 seconds remaining. How many seconds is that in total?
335 seconds
5 × 60 = 300 seconds, plus 35 seconds = 335 seconds.
9. A countdown timer shows 10 minutes and 10 seconds remaining. How many seconds is that in total?
610 seconds
10 × 60 = 600 seconds, plus 10 seconds = 610 seconds.
10. 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.
11. A countdown timer shows 13 minutes and 5 seconds remaining. How many seconds is that in total?
785 seconds
13 × 60 = 780 seconds, plus 5 seconds = 785 seconds.
12. 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.

12 questions · Seed 50 · Age guidance, not curriculum certification