Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 4 km 21 m = ______ cm
- 2 km 9 m = ______ m
- 2 km 790 m = _______ m
- 5 km 7 m 8 cm = _______ cm
(a)
1 km = 100000 cm
1 m = 100 cm
4 km 21 m
= 4 x 100000 + 21 x 100
= 400000 + 2100
= 402100 cm
(b)
1 km = 1000 m
2 km 9 m
= 2 x 1000 + 9
= 2000 + 9
= 2009 m
(c)
1 km = 1000 m
2 km 790 m
= 2 x 1000 + 790
= 2000 + 790
= 2790 m
(d)
1 km = 100000 cm
1 m = 100 cm
5 km 7 m 8 cm
= 5 x 100000 + 7 x 100 + 8
= 500000 + 700 + 8
= 500708 cm
Answer(s): 402100, 2009, 2790, 500708