Cambridge International Mathematics

26 Assumed Knowledge (Number)

UNITS OF TIME

1 minute=60seconds 1 hour=60minutes= 3600seconds

1 day=24hours 1 week=7days

1 year=12months= 365days 1 decade=10years

1 century= 100years

1 millennium= 1000years

Example 35 Self Tutor

Convert 8 days 7 hours and 6 minutes to minutes.

8 days£ 24 £60 = 11 520minutes

7 hours£60 = 420 minutes

6 minutes=6minutes

) total= 11 946minutes

Example 36 Self Tutor

Convert 30 240minutes to days.

30 240 = (30 240¥60)hours f 60 min in 1 hourg

= 504hours

= (504¥24)days f 24 hours in 1 dayg

=21days

Example 37 Self Tutor

Convert 3 hours, 14 minutes to seconds.

3 hours, 14 minutes=(3£60)min+14min f 60 min in 1 hourg

= 194min

= (194£60)s

= 11 640s

1 Convert the following times to minutes:

a 5 hours b 3 days c 2 days 15 hours d 2220 seconds

2 Convert the following times to days:

a 1248 hours b 23 040min c 3 years d 6 hours

3 Convert the following times to seconds:

a 35 minutes b 3 hours 19 min c 5 days d 1 week 2 days

EXERCISE I.1

fg 60 s in 1 min

IGCSE01

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