Time practice

Time before and after a clock

Read an original clock, then find times before or after it using separate hour-and-minute offsets.

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First write the original clock time. For each of the three offset questions, return to that original time and calculate the requested time before or after it. These are independent calculations on a twelve-hour clock; the face does not specify AM or PM.

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Learning objective

What this activity builds

Move forward or backward by a stated duration while keeping the original clock as the starting point for every calculation.

Worked example

The original clock shows 10:40. What is 30 minutes after it, and what is 20 minutes before it?

30 minutes after is 11:10; 20 minutes before is 10:20.

For the first answer, move 20 minutes to 11:00 and another 10 to 11:10. For the second answer, start again at 10:40 and move back 20 minutes to 10:20. Subtracting from the first answer would change the starting point and solve a different problem.

Teaching notes

Make the practice count

  • Have the learner underline the original time and reread before or after for each prompt.
  • Begin with one kind of offset, then use the pattern, addition, subtraction or mixed-operation setting when ready. The default pattern is after, before, after.
  • Wrap correctly around the clock: 25 minutes after 12:50 is 1:15. This is a clock-face calculation, not evidence of a particular day or AM/PM period.

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Worksheet settings

Sets the spacing of starting times only. Duration minutes and ending times do not have to follow this step.

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Configured PDF · Time Before and After · US Letter

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Math SheetNameScore/ 16TeacherDateTime Before and AfterRead each clock, then find three independent times before or after the original time on the same twelve-hour clock cycle.123456789101112Original time3 hours after20 minutes before40 minutes after123456789101112Original time3 hours after20 minutes before2 hours 20 minutes after123456789101112Original time2 hours after2 hours 40 minutes before2 hours 20 minutes after123456789101112Original time3 hours after3 hours 20 minutes before20 minutes aftermath-sheet.comPage 1 / 1

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