4 x 7 = 28
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the shortcut way of dividing is mutiplying
It means calculate the value of the expression (i.e. simplify) by mutiplying. So, as a completely random example, if you have an expression like: x(x + 1) then, in this particular case, you would multiply what is outside of the brackets by each term inside the brackets to get: x2 + x.
28 + 28 = 56.56 + 28 = 84.
28 cubed = 21,952 (28 x 28 x 28 = 21,952)
Answer is 100.100*28/100= 28