A cube is L x W x H where L=W=H.
A km3 has L, W and H of 1 km. Each km is 1000 meters and each meter is 100 centimeters.
Therefore 1 km is 1000 x 100 cm or 100,000 cm. This is L and W and H.
L x W x H = 100,000 x 100,000 x 100,000
L x W x H = 1,000,000,000,000,000 cm3
1 km3 = 1,000,000,000,000,000 cm3
1 km3 = 1 x 1015 cm3
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There are 1000m in a km. Thus if we cube both numbers we get 1,000,000,000m3 in a km3. Therefore, to convert from km3 to m3 you have to multiply the number you have by 1,000,000,000.
548.6 cm3
5 cm
.10g/cm3
The volume of this cube is 343 cm3