Question

How many millimeters are there in 2.5 x10 2 km?

Answer 1

1000 m = 1.0 km

1 m = 100 cm

1 cm = 10 mm

2.5 x10^ 2 km*1000 m/1.0 km*100 cm/1 m*10 mm/ 1 cm

= 250 000 000 millimeters

=2.50 x10^ 8 millimeters