Question

Find the sum by suitable rearrangement: (a) `297xx17+297xx3` (b) `54279xx92+8xx54279` (c) `81265xx169-81265xx69` (d) `3845xx5xx782+769xx25xx218`

Answer 1

(a)`297*17+297*3`
`=297(17+3)= 297*20`
`=5940` answer
(b)`54279*92 + 8*54279`
`=54279(92+8)= 54279*100`
`=5427900`
(c)`81265*169- 81265*69`
`=81265(169-69)= 81265*100`
`=8126500`
(d)`3845*5*782 + 769*25*218`
`= 3845*5*782+(769*5)*5*218`
`=3845*5*782+ 3845*5*218`
`=3845*5(782+218)= 19225*1000`
`= 19225000` answer