Answer:
25 m = 2500 cm (since 1 m = 100 cm)
3 km =
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m
3 km = 3000 m (since 1 km = 1000 m)
1500 mm =
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m
1500 mm = 1.5 m (since 1000 mm = 1 m)
5 cm =
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mm
5 cm = 50 mm (since 1 cm = 10 mm)
2.5 m =
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cm
2.5 m = 250 cm (since 1 m = 100 cm)
8 km =
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mm
8 km = 8,000,000 mm (since 1 km = 1000 m and 1 m = 1000 mm)