Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 4 min 23 s = _____ s
- 4 h 20 min = _____ min
- 145 s = 2 min _____ s
- 549 min = _____ h 9 min
(a)
1 min = 60 s
4 min 23 s
= 4 x 60 + 23
= 240 + 23
= 263 s
(b)
1 h = 60 min
4 h 20 min
= 4 x 60 + 20
= 240 + 20
= 260 min
(c)
60 s = 1 min
120 s = 120 ÷ 60 = 2 min
145 s
= 120 + 25
= 2 min 25 s
(d)
60 min = 1 h
540 min = 540 ÷ 60 = 9 h
549 min
= 540 + 9
= 9 h 9 min
Answer(s): 263, 260, 25, 9