50:2500000= 1:50000

(2)3.5÷ 1:3000000 = 105000000cm = 1050km。

③ 500m = 50000m.

50000× 1:20000 = 2.5 cm.

(4)3.5÷ 1:500000 = 1750000cm = 17.5km。

460 km = 46 million cm

46000000× 1:500000=92 cm

(5) Actual length: 6 ÷1:400 = 2400 cm = 24 m.

Actual width: 4.5×1:400 =1800 cm =18m.

Actual area: 24× 18=432 square meters.

(6)5÷ 1:6000000=30000000 cm

300000000×1:3000000 =10 cm