1.

Find the sum by suitable rearrangement: (a) `2xx1768xx50` (b) `4xx166xx25` (c) `8xx291xx125` (d) `625xx279xx16` (e) `285xx5xx60` (f) `125xx40xx8xx25`

Answer» (a) `2*1768*50`
`= (2*50)*1768 = 176800`
(b) `4*166*25`
`= (4*25)*166`
`= 100*166 = 16600`
(c) `8*291*125`
`= (8*125)*291`
`= 1000*291 = 291000`
(d) `625*279*16`
`= (625*16)*279= 10000*279`
`= 2790000`
(e) `285*5*60`
`= 285*(5*60)= 285*300`
`= 85500`
(f) `125*40*8*25 = (125*8)*(40*25)`
`= 1000*1000`
`=1000000`
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