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Time sizes: convert

You learn to convert units of time, even with a decimal point, like 2.5 hours to minutes.

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How to work it out

  1. Find the step between the two units: a day is 24 hours, an hour is 60 minutes.
  2. If you go to a smaller unit, multiply by that step.
  3. If you go to a larger unit, divide by that step.
  4. If the time has a decimal point, work out the whole part and the part after the decimal point separately.
day× 24hour× 60minute× 60second

3 days = ? hours

  1. From days to hours: 1 day is 24 hours.
  2. Multiply by 24: 3 × 24 = 72.
  3. It is 72 hours.
More examples

2.5 hours = ? minutes

  1. From hours to minutes: 1 hour is 60 minutes.
  2. Do the whole part: 2 × 60 = 120.
  3. Do the decimal part: 0.5 × 60 = 30.
  4. Add them: 120 + 30 = 150.
  5. It is 150 minutes.

90 minutes = ? hours

  1. From minutes to hours: divide by 60.
  2. 90 ÷ 60 = 1.5.
  3. It is 1.5 hours.