Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 4 km 49 m = ______ cm
- 4 km 5 m = ______ m
- 7 km 458 m = _______ m
- 9 km 2 m 8 cm = _______ cm
(a)
1 km = 100000 cm
1 m = 100 cm
4 km 49 m
= 4 x 100000 + 49 x 100
= 400000 + 4900
= 404900 cm
(b)
1 km = 1000 m
4 km 5 m
= 4 x 1000 + 5
= 4000 + 5
= 4005 m
(c)
1 km = 1000 m
7 km 458 m
= 7 x 1000 + 458
= 7000 + 458
= 7458 m
(d)
1 km = 100000 cm
1 m = 100 cm
9 km 2 m 8 cm
= 9 x 100000 + 2 x 100 + 8
= 900000 + 200 + 8
= 900208 cm
Answer(s): 404900, 4005, 7458, 900208