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 12 minutes and 15 seconds remaining. How many seconds is that in total?
12 m · 15 s · Working backwards from fin…
2. 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…
3. A countdown timer shows 8 minutes and 15 seconds remaining. How many seconds is that in total?
8 m · 15 s · Working backwards from fin…
4. A countdown timer shows 11 minutes and 10 seconds remaining. How many seconds is that in total?
11 m · 10 s · Working backwards from fin…
5. A countdown timer shows 13 minutes and 25 seconds remaining. How many seconds is that in total?
13 m · 25 s · Working backwards from fin…
6. A countdown timer shows 11 minutes and 40 seconds remaining. How many seconds is that in total?
11 m · 40 s · Working backwards from fin…
7. A countdown timer shows 1 minute and 40 seconds remaining. How many seconds is that in total?
1 m · 40 s · Working backwards from fin…
8. 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…
9. A countdown timer shows 2 minutes and 40 seconds remaining. How many seconds is that in total?
2 m · 40 s · Working backwards from fin…
10. A countdown timer shows 5 minutes and 15 seconds remaining. How many seconds is that in total?
5 m · 15 s · Working backwards from fin…
11. A countdown timer shows 15 minutes and 10 seconds remaining. How many seconds is that in total?
15 m · 10 s · Working backwards from fin…
12. A countdown timer shows 4 minutes and 5 seconds remaining. How many seconds is that in total?
4 m · 5 s · Working backwards from fin…

12 questions · Seed 104734 · 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 12 minutes and 15 seconds remaining. How many seconds is that in total?
735 seconds
12 × 60 = 720 seconds, plus 15 seconds = 735 seconds.
2. 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.
3. A countdown timer shows 8 minutes and 15 seconds remaining. How many seconds is that in total?
495 seconds
8 × 60 = 480 seconds, plus 15 seconds = 495 seconds.
4. A countdown timer shows 11 minutes and 10 seconds remaining. How many seconds is that in total?
670 seconds
11 × 60 = 660 seconds, plus 10 seconds = 670 seconds.
5. A countdown timer shows 13 minutes and 25 seconds remaining. How many seconds is that in total?
805 seconds
13 × 60 = 780 seconds, plus 25 seconds = 805 seconds.
6. A countdown timer shows 11 minutes and 40 seconds remaining. How many seconds is that in total?
700 seconds
11 × 60 = 660 seconds, plus 40 seconds = 700 seconds.
7. A countdown timer shows 1 minute and 40 seconds remaining. How many seconds is that in total?
100 seconds
1 × 60 = 60 seconds, plus 40 seconds = 100 seconds.
8. 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.
9. A countdown timer shows 2 minutes and 40 seconds remaining. How many seconds is that in total?
160 seconds
2 × 60 = 120 seconds, plus 40 seconds = 160 seconds.
10. A countdown timer shows 5 minutes and 15 seconds remaining. How many seconds is that in total?
315 seconds
5 × 60 = 300 seconds, plus 15 seconds = 315 seconds.
11. A countdown timer shows 15 minutes and 10 seconds remaining. How many seconds is that in total?
910 seconds
15 × 60 = 900 seconds, plus 10 seconds = 910 seconds.
12. A countdown timer shows 4 minutes and 5 seconds remaining. How many seconds is that in total?
245 seconds
4 × 60 = 240 seconds, plus 5 seconds = 245 seconds.

12 questions · Seed 104734 · 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 12 minutes and 15 seconds remaining. How many seconds is that in total?
12 m · 15 s · Working backwards from fin…
2. 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…
3. A countdown timer shows 8 minutes and 15 seconds remaining. How many seconds is that in total?
8 m · 15 s · Working backwards from fin…
4. A countdown timer shows 11 minutes and 10 seconds remaining. How many seconds is that in total?
11 m · 10 s · Working backwards from fin…
5. A countdown timer shows 13 minutes and 25 seconds remaining. How many seconds is that in total?
13 m · 25 s · Working backwards from fin…
6. A countdown timer shows 11 minutes and 40 seconds remaining. How many seconds is that in total?
11 m · 40 s · Working backwards from fin…
7. A countdown timer shows 1 minute and 40 seconds remaining. How many seconds is that in total?
1 m · 40 s · Working backwards from fin…
8. 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…
9. A countdown timer shows 2 minutes and 40 seconds remaining. How many seconds is that in total?
2 m · 40 s · Working backwards from fin…
10. A countdown timer shows 5 minutes and 15 seconds remaining. How many seconds is that in total?
5 m · 15 s · Working backwards from fin…
11. A countdown timer shows 15 minutes and 10 seconds remaining. How many seconds is that in total?
15 m · 10 s · Working backwards from fin…
12. A countdown timer shows 4 minutes and 5 seconds remaining. How many seconds is that in total?
4 m · 5 s · Working backwards from fin…

12 questions · Seed 104734 · 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 12 minutes and 15 seconds remaining. How many seconds is that in total?
735 seconds
12 × 60 = 720 seconds, plus 15 seconds = 735 seconds.
2. 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.
3. A countdown timer shows 8 minutes and 15 seconds remaining. How many seconds is that in total?
495 seconds
8 × 60 = 480 seconds, plus 15 seconds = 495 seconds.
4. A countdown timer shows 11 minutes and 10 seconds remaining. How many seconds is that in total?
670 seconds
11 × 60 = 660 seconds, plus 10 seconds = 670 seconds.
5. A countdown timer shows 13 minutes and 25 seconds remaining. How many seconds is that in total?
805 seconds
13 × 60 = 780 seconds, plus 25 seconds = 805 seconds.
6. A countdown timer shows 11 minutes and 40 seconds remaining. How many seconds is that in total?
700 seconds
11 × 60 = 660 seconds, plus 40 seconds = 700 seconds.
7. A countdown timer shows 1 minute and 40 seconds remaining. How many seconds is that in total?
100 seconds
1 × 60 = 60 seconds, plus 40 seconds = 100 seconds.
8. 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.
9. A countdown timer shows 2 minutes and 40 seconds remaining. How many seconds is that in total?
160 seconds
2 × 60 = 120 seconds, plus 40 seconds = 160 seconds.
10. A countdown timer shows 5 minutes and 15 seconds remaining. How many seconds is that in total?
315 seconds
5 × 60 = 300 seconds, plus 15 seconds = 315 seconds.
11. A countdown timer shows 15 minutes and 10 seconds remaining. How many seconds is that in total?
910 seconds
15 × 60 = 900 seconds, plus 10 seconds = 910 seconds.
12. A countdown timer shows 4 minutes and 5 seconds remaining. How many seconds is that in total?
245 seconds
4 × 60 = 240 seconds, plus 5 seconds = 245 seconds.

12 questions · Seed 104734 · Age guidance, not curriculum certification