One kilometre is equal to 1000 x 100 = 100000 centimetres. Therefore, 30 kilometres is equal to 30 x 100000 = 3000000 centimetres.
70000000+3000000+100000+8000+2
3000000+100000+2000+500+70
3000000 x 7 = 21000000
This is represented as: 10 x 3000000 = 30000000
3000000 x 8077567 = 24232701000000
3000000 (Three million)
3000000 x 3
130 x 3 million = 390 million
100000 x 2 = 200,000
100000
Simple. 3 x 107