Page 331 - Math Smart - 7

400 = 360 + 40 d) 725 = 720 + 5
360 min = 360 ■¥ 60 720 s = 720 + 60
= 6h = 12 min
400 min = 6 h 40 mIn 725 s = 12 min 5 s

Convert There are 60 minutes in
an hour.
a) 140 min to h, and b) 960 s to min.
0.5 h means 'half an
Solution
hour'. So, 0.5 h = 30
a) 140 min = 140+ 60 b) 960 s = 960 + 60 minutes.

= 14 + 6 = 16 min
= 2.5h

Check My

Understanding

o Write the time using the 24-hour notation.
a) 1a.m. b) 7 a.m. c) 4 p.m. d) 10 p.m.

© Write the time using the 24-hour notation.
a) 2.45a.m. b) 11.23a.m. c) 2.05p.m. d)n.59p.m.

e Find the duration of time,
a) From 00 10 to 09 40 b) From 08 00 to 13 50
c) From 15 15 to 19 00 d) From 17 30 to 23 45

o Convert the following to minutes,
a) 6 h b) 3 h 15 min c) 9 h 20 min d) 600 s
© Convert the following to seconds.
a) 8 min b) 7 min 24 s c) 30 min 2 s
© Convert 240 min to h.

© Convert 350 min to h and min.
o Convert 520 s to min and s.
© Fill in the blanks.
a) seconds in 5 minutes b) minutes in 3 hours

c) minutes in half an hour d) hours in half a day
e) minutes in ^ of an hour f) hours in | of a day

g) seconds in ^ of a minute h) hours in 4 ^ days
i) hours in 2 days j) seconds in 7^ minutes
k) minutes in 4^ hours I) hours in 10 days