Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 1 min 18 s = _____ s
- 4 h 15 min = _____ min
- 135 s = 2 min _____ s
- 487 min = _____ h 7 min
(a)
1 min = 60 s
1 min 18 s
= 1 x 60 + 18
= 60 + 18
= 78 s
(b)
1 h = 60 min
4 h 15 min
= 4 x 60 + 15
= 240 + 15
= 255 min
(c)
60 s = 1 min
120 s = 120 ÷ 60 = 2 min
135 s
= 120 + 15
= 2 min 15 s
(d)
60 min = 1 h
480 min = 480 ÷ 60 = 8 h
487 min
= 480 + 7
= 8 h 7 min
Answer(s): 78, 255, 15, 8