Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 3 km 78 m = ______ cm
- 3 km 4 m = ______ m
- 3 km 231 m = _______ m
- 7 km 7 m 3 cm = _______ cm
(a)
1 km = 100000 cm
1 m = 100 cm
3 km 78 m
= 3 x 100000 + 78 x 100
= 300000 + 7800
= 307800 cm
(b)
1 km = 1000 m
3 km 4 m
= 3 x 1000 + 4
= 3000 + 4
= 3004 m
(c)
1 km = 1000 m
3 km 231 m
= 3 x 1000 + 231
= 3000 + 231
= 3231 m
(d)
1 km = 100000 cm
1 m = 100 cm
7 km 7 m 3 cm
= 7 x 100000 + 7 x 100 + 3
= 700000 + 700 + 3
= 700703 cm
Answer(s): 307800, 3004, 3231, 700703