Ingenious calculation of 100-99.89 + 9.09-0.11 =

100-（99.89+0.11）+9.09

How to calculate 6 + 12 + 18 +. + 120 simply?

6+12+18+...+120
=6×(1+2+3+...+20)
=6×(1+20)×20÷2
=1260

What is the simple calculation of 2 / 15 [12,6-1 (33 / 5 + 0,125 / 12,5%)]

12.6=12+3/5=63/5
33/5+0、125/12、5%=33/5+1=38/5
63/5-38/5=25/5=5
Original formula = (2 / 15) * 5 = 2 / 3

Simple calculation 11 * (1 / 11 + 1 / 10) * 1

11*（1/11 +1/10）*10
=(1+11/10)*10
=10+11
=21

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