There ain't no way we'll lose it." (Twisted Sister)
O.K. - I found these tips from- Basic mathematics.com
And it makes sense. Why take the question the way it is given to us?
Why not twist or rearrange things to our advantage?
Examples of additive compensation
Add 97 + 64
It may not be easy to add 97 and 64 mentally. However, one small adjustment
such as rewriting the problem as 97 + 3 + 61 can help us to get an answer quickly
97 + 3 + 61 = 100 + 61 = 161
Add 25, 27 , and 18
It is not easy to do any of these additions mentally.
25 + 27 25 + 18 27 + 18
However, if we take 2 from 27 and add that to 18, the problem becomes
25 + 25 + 20 and this is very easy to do mentally since 25 + 25 = 50 and 50 + 20 = 70
Examples of equal additions method
The equal additions method is a compensation used when doing subtractions.
Subtract 39 from 57.
57 - 39 can be thought of as 58 - 40
58 - 40 = 18
To make the subtraction 58 - 40, we added 1 to 57 and 39 so that we still have the same subtraction problem.
Work SMART, not HARD!
