multiply 200 km ,350m,90cm by 20
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1 m= 100cm
1km=100m
1km=1000*100cm
200km= 200*1000*100
=20000000cm
20*20000000=400000000cm
350m=350*100
=35000
20*35000 =700000cm
90cm =90cm
:.40,00,00,000+7,00,000+90
=40,07,00,090
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