Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 7 min 7 s = _____ s
- 2 h 25 min = _____ min
- 200 s = 3 min _____ s
- 312 min = _____ h 12 min
(a)
1 min = 60 s
7 min 7 s
= 7 x 60 + 7
= 420 + 7
= 427 s
(b)
1 h = 60 min
2 h 25 min
= 2 x 60 + 25
= 120 + 25
= 145 min
(c)
60 s = 1 min
180 s = 180 ÷ 60 = 3 min
200 s
= 180 + 20
= 3 min 20 s
(d)
60 min = 1 h
300 min = 300 ÷ 60 = 5 h
312 min
= 300 + 12
= 5 h 12 min
Answer(s): 427, 145, 20, 5