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1000 mm = 1 m so 70 mm = 70/1000 = 0.07 metres. Simple!
10 mm = 1 cm 20 mm = 2 cm 30 mm = 3 cm . . 70 mm = 7 cm
1 cm is equal to 10 mm so 70 cm would be 700 mm.
One cm contains 10 mm. So, 7 x 10 = 70 mm.
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