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 40 seconds remaining. How many seconds is that in total?
15 m · 40 s · Working backwards from fin…
2. A countdown timer shows 6 minutes and 15 seconds remaining. How many seconds is that in total?
6 m · 15 s · Working backwards from fin…
3. A countdown timer shows 2 minutes and 5 seconds remaining. How many seconds is that in total?
2 m · 5 s · Working backwards from fin…
4. A countdown timer shows 5 minutes and 10 seconds remaining. How many seconds is that in total?
5 m · 10 s · Working backwards from fin…
5. A countdown timer shows 11 minutes and 35 seconds remaining. How many seconds is that in total?
11 m · 35 s · Working backwards from fin…
6. A countdown timer shows 11 minutes and 25 seconds remaining. How many seconds is that in total?
11 m · 25 s · Working backwards from fin…
7. A countdown timer shows 12 minutes and 10 seconds remaining. How many seconds is that in total?
12 m · 10 s · Working backwards from fin…
8. 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…
9. A countdown timer shows 15 minutes and 20 seconds remaining. How many seconds is that in total?
15 m · 20 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 10 minutes and 15 seconds remaining. How many seconds is that in total?
10 m · 15 s · Working backwards from fin…
12. A countdown timer shows 12 minutes and 20 seconds remaining. How many seconds is that in total?
12 m · 20 s · Working backwards from fin…

12 questions · Seed 46 · 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 40 seconds remaining. How many seconds is that in total?
940 seconds
15 × 60 = 900 seconds, plus 40 seconds = 940 seconds.
2. A countdown timer shows 6 minutes and 15 seconds remaining. How many seconds is that in total?
375 seconds
6 × 60 = 360 seconds, plus 15 seconds = 375 seconds.
3. A countdown timer shows 2 minutes and 5 seconds remaining. How many seconds is that in total?
125 seconds
2 × 60 = 120 seconds, plus 5 seconds = 125 seconds.
4. A countdown timer shows 5 minutes and 10 seconds remaining. How many seconds is that in total?
310 seconds
5 × 60 = 300 seconds, plus 10 seconds = 310 seconds.
5. A countdown timer shows 11 minutes and 35 seconds remaining. How many seconds is that in total?
695 seconds
11 × 60 = 660 seconds, plus 35 seconds = 695 seconds.
6. A countdown timer shows 11 minutes and 25 seconds remaining. How many seconds is that in total?
685 seconds
11 × 60 = 660 seconds, plus 25 seconds = 685 seconds.
7. A countdown timer shows 12 minutes and 10 seconds remaining. How many seconds is that in total?
730 seconds
12 × 60 = 720 seconds, plus 10 seconds = 730 seconds.
8. 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.
9. A countdown timer shows 15 minutes and 20 seconds remaining. How many seconds is that in total?
920 seconds
15 × 60 = 900 seconds, plus 20 seconds = 920 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 10 minutes and 15 seconds remaining. How many seconds is that in total?
615 seconds
10 × 60 = 600 seconds, plus 15 seconds = 615 seconds.
12. A countdown timer shows 12 minutes and 20 seconds remaining. How many seconds is that in total?
740 seconds
12 × 60 = 720 seconds, plus 20 seconds = 740 seconds.

12 questions · Seed 46 · 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 40 seconds remaining. How many seconds is that in total?
15 m · 40 s · Working backwards from fin…
2. A countdown timer shows 6 minutes and 15 seconds remaining. How many seconds is that in total?
6 m · 15 s · Working backwards from fin…
3. A countdown timer shows 2 minutes and 5 seconds remaining. How many seconds is that in total?
2 m · 5 s · Working backwards from fin…
4. A countdown timer shows 5 minutes and 10 seconds remaining. How many seconds is that in total?
5 m · 10 s · Working backwards from fin…
5. A countdown timer shows 11 minutes and 35 seconds remaining. How many seconds is that in total?
11 m · 35 s · Working backwards from fin…
6. A countdown timer shows 11 minutes and 25 seconds remaining. How many seconds is that in total?
11 m · 25 s · Working backwards from fin…
7. A countdown timer shows 12 minutes and 10 seconds remaining. How many seconds is that in total?
12 m · 10 s · Working backwards from fin…
8. 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…
9. A countdown timer shows 15 minutes and 20 seconds remaining. How many seconds is that in total?
15 m · 20 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 10 minutes and 15 seconds remaining. How many seconds is that in total?
10 m · 15 s · Working backwards from fin…
12. A countdown timer shows 12 minutes and 20 seconds remaining. How many seconds is that in total?
12 m · 20 s · Working backwards from fin…

12 questions · Seed 46 · 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 40 seconds remaining. How many seconds is that in total?
940 seconds
15 × 60 = 900 seconds, plus 40 seconds = 940 seconds.
2. A countdown timer shows 6 minutes and 15 seconds remaining. How many seconds is that in total?
375 seconds
6 × 60 = 360 seconds, plus 15 seconds = 375 seconds.
3. A countdown timer shows 2 minutes and 5 seconds remaining. How many seconds is that in total?
125 seconds
2 × 60 = 120 seconds, plus 5 seconds = 125 seconds.
4. A countdown timer shows 5 minutes and 10 seconds remaining. How many seconds is that in total?
310 seconds
5 × 60 = 300 seconds, plus 10 seconds = 310 seconds.
5. A countdown timer shows 11 minutes and 35 seconds remaining. How many seconds is that in total?
695 seconds
11 × 60 = 660 seconds, plus 35 seconds = 695 seconds.
6. A countdown timer shows 11 minutes and 25 seconds remaining. How many seconds is that in total?
685 seconds
11 × 60 = 660 seconds, plus 25 seconds = 685 seconds.
7. A countdown timer shows 12 minutes and 10 seconds remaining. How many seconds is that in total?
730 seconds
12 × 60 = 720 seconds, plus 10 seconds = 730 seconds.
8. 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.
9. A countdown timer shows 15 minutes and 20 seconds remaining. How many seconds is that in total?
920 seconds
15 × 60 = 900 seconds, plus 20 seconds = 920 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 10 minutes and 15 seconds remaining. How many seconds is that in total?
615 seconds
10 × 60 = 600 seconds, plus 15 seconds = 615 seconds.
12. A countdown timer shows 12 minutes and 20 seconds remaining. How many seconds is that in total?
740 seconds
12 × 60 = 720 seconds, plus 20 seconds = 740 seconds.

12 questions · Seed 46 · Age guidance, not curriculum certification