Question : 7.5% of 1400 + 4.5% of 3600= ? ÷ 5
so what will be your steps. will you calculate 7.5x1400/100 or quick multiply 7.5 x14 like this 7x14 + 0.5x14 =98+7=105
be more quick in calculation multiply 7.5 x14 like (7.5 x2 x7) will lead to 15 x7 =105
similarly 4.5 x 36= 9x18=18x9= 162
now add 105+162= 267
you have to find 267x5
and you can do it by 267x10/2 = 2670/2 =1375
26/2=13 70/2=35
more division tricks will be discussed in coming examples.
so this question can be solved in maximum 45 seconds and you save a flat 15 second.
if you do it earlier,more seconds are yours .. so enjoy rapid calculation....
so what will be your steps. will you calculate 7.5x1400/100 or quick multiply 7.5 x14 like this 7x14 + 0.5x14 =98+7=105
be more quick in calculation multiply 7.5 x14 like (7.5 x2 x7) will lead to 15 x7 =105
similarly 4.5 x 36= 9x18=18x9= 162
now add 105+162= 267
you have to find 267x5
and you can do it by 267x10/2 = 2670/2 =1375
26/2=13 70/2=35
more division tricks will be discussed in coming examples.
so this question can be solved in maximum 45 seconds and you save a flat 15 second.
if you do it earlier,more seconds are yours .. so enjoy rapid calculation....
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