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5. Convert these into seconds.
a. 8 minutes b. 12 minutes 54 seconds
c. 21 minutes 36 seconds d. 3 hours 25 minutes 16 seconds

6. Convert these into minutes.
a. 14 hours b. 9 hours 54 minutes
c. 13 hours 48 minutes d. 3 days 12 hours 35 minutes

7. Convert these into hours.
a. 7 days 15 hours b. 13 days c. 8 days 19 hours d. 12 days 6 hours

8. Convert these into days.
a. 6 weeks 5 days b. 9 weeks 4 days c. 42 weeks 1 day d. 3 years

9. Convert these into months.

a. 10 years b. 5 years 10 months c. 12 years 7 months
10. Convert these into hours and minutes.

a. 138 minutes b. 395 minutes c. 1023 minutes d. 2006 minutes

11. Convert these into minutes and seconds.
a. 1414 seconds b. 2165 seconds

12. Convert these into days and hours.
a. 75 hours b. 735 hours c. 539 hours d. 1018 hours

13. Convert these into weeks and days.
a. 230 days b. 341 days

ADDiTioN AND SuBTrACTioN of MeASureS of TiMe

To perform addition or subtraction of time, we arrange the same units
of time in the same columns and then add or subtract. Tips
example 1. Add:

a. 7 hours 34 minutes + 9 hours 47 minutes We use ‘h’ for ‘hours’,
‘min’ for ‘minutes’, ‘s’ for
b. 26 minutes 48 seconds + 13 minutes 56 seconds seconds when writing
units of time in short.
Solution.

a. Step 1. Add minutes: 34 + 47 = 81 min
81 min = (60 + 21) min

= 60 min + 21 min = 1 h 21 min

Step 2. Add hours: 1 + 7 + 9 = 17 hours

Thus, 7 hours 34 minutes + 9 hours 47 minutes = 17 hours 21 minutes.

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Time