Measurement Conversions • Topic 3 of 4

Time Conversions

Time conversions do NOT follow powers of 10 — so we must memorize these relationships:

  • 1 hour = 60 minutes
  • 1 minute = 60 seconds
  • 1 day = 24 hours
  • 1 week = 7 days

To convert hours to minutes: multiply by 60.
To convert minutes to hours: divide by 60.

For elapsed time (how long something took): convert start and end to the same unit, then subtract.

Time Conversion ChartHours to Minutesx 603 hours = 180 minMinutes to Hours/ 60150 min = 2h 30mDays and Weeks1 day = 24 hours1 week = 7 days
Solved Examples
1
Worked Example
Convert 3 hours to minutes.
Solution1 hour = 60 minutes. 3 hours = 3 x 60 = 180 minutes.
2
Worked Example
Convert 150 minutes to hours and minutes.
Solution60 minutes = 1 hour. 150 / 60 = 2 hours with remainder 30. Answer: 2 hours 30 minutes.
3
Worked Example
A movie starts at 2:30 PM and ends at 4:45 PM. How long is it in minutes?
SolutionFrom 2:30 to 4:30 = 2 hours = 120 minutes. From 4:30 to 4:45 = 15 minutes. Total = 120 + 15 = 135 minutes.

Key Points

  • 1 hour = 60 minutes (not 10 or 100!)
  • 1 minute = 60 seconds; 1 day = 24 hours; 1 week = 7 days
  • For elapsed time: find time from start to end
  • Time conversions use x60 (larger to smaller) and /60 (smaller to larger)
Quick Check — 4 MCQs
Tap an option to check your answer0 / 4
Q1.$1$ hour equals:
Explanation: $60$ minutes.
Q2.$1$ minute equals:
Explanation: $60$ seconds.
Q3.$1$ day equals:
Explanation: $24$ hours.
Q4.$1$ week equals:
Explanation: $7$ days.
Practice more MCQs → 📝 Assignment · 35 marks