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(b) Since, 1 year = 12 months

So, 11 years 9 months = 11 years + 9 months

= (11 × 12) months + 9 months

= 132 months + 9 months = 141 months

Conversion of Lower Units into Higher Units

To convert lower units of time into higher units, we divide.

example 5: Convert 3308 seconds into minutes and seconds. 55
Solution: Since 60 seconds = 1 minute 60 3308
300
3308 seconds = (3308 ÷ 60) minutes 308
300
Quotient = 55, Remainder = 8 8

Thus, 3308 seconds = 55 minutes 8 seconds

example 6: Convert 532 minutes into hours and minutes.

Solution: Since 60 minutes = 1 hour 8
60 532
532 minutes = (532 ÷ 60) hours 480

Quotient = 8, Remainder = 52 52

Thus, 532 minutes = 8 hours 52 minutes
example 7: Convert 789 hours into days and hours.
32
Solution: Since 24 hours = 1 day 24 789
72
789 hours = (789 ÷ 24) days 69

Quotient = 32, Remainder = 21 48
21
Thus, 789 hours = 32 days 21 hours

example 8: Convert 366 days into weeks and days.
52
Solution: Since 7 days = 1 week
7 366
366 days = (366 ÷ 7) weeks 35
16
Quotient = 52 weeks, Remainder = 2 days 14
2
Thus, 366 days = 52 weeks 2 days

Knowledge Desk
A leap year has 366 days. Julius Caesar introduced the first calendar leap year in 46 B.C. The
Earth takes exactly 365 days, 5 hours, 48 minutes and 45 seconds to move around the Sun.

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