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Mental calculation technique

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Mental calculation technique

Mental calculation technique

ExampleMental calculationReason
398*41600-8=1592398*4=(400-2)*4
=400*4-2*4
=1600-8
240*5120*10divide by 2 and multiply by 10 240*5=240*10/2
=(240/2)*10
=120*10
320/5640/10multiply by 2 and divide by 10 320/5=320/(10/2)
=(320*2)/10
=640/10
760*20076*2*2000calculate 76*2 and multiply by 1000 760*200=76*10*2*100
=76*2*1000
12*253*100divide by 4 and multiply by 100 12*25=12*(100/4)
=(12/4)*100
=3*100
13*991300-1313*99=13*(100-1)
=1300-13
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