Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 7 km 21 m = ______ cm
- 2 km 7 m = ______ m
- 5 km 583 m = _______ m
- 3 km 2 m 4 cm = _______ cm
(a)
1 km = 100000 cm
1 m = 100 cm
7 km 21 m
= 7 x 100000 + 21 x 100
= 700000 + 2100
= 702100 cm
(b)
1 km = 1000 m
2 km 7 m
= 2 x 1000 + 7
= 2000 + 7
= 2007 m
(c)
1 km = 1000 m
5 km 583 m
= 5 x 1000 + 583
= 5000 + 583
= 5583 m
(d)
1 km = 100000 cm
1 m = 100 cm
3 km 2 m 4 cm
= 3 x 100000 + 2 x 100 + 4
= 300000 + 200 + 4
= 300204 cm
Answer(s): 702100, 2007, 5583, 300204