•ROUND THE ORDER OF MAGNITUDE Round a lot, to the nearest “power ten”. So 218 comes 100, and 2,180 becomes 1,000.
•SLIDE THE DECIMAL POINT Compact those zeros created by rounding. So 200,000,000 becomes 2•10^8 (exponential notation).
•SUBSTITUTE A NUMBER YOU CAN REMEMBER Instead of rounding, find a nearby number you can remember. So 218 becomes 222, or 210 or 200, something else easy.
You need to make the number which needs to be simplified into a number lower than the original number.
For example:
"4" would simplify to "2"
beace half of 4 is 2. This could further be simplifed as "1" is half of 2.
so if there was a fraction:
4/8
the numerator would simplify to 1 and the denominator would simplify to 2 because whatever you do to the top you must do to the bottom. The numerator stops simplifying at 1 and the denominator stops simplifying at 2
Definition: Let f be one-to-one function with the domain A and the range B. Then the inverse function has the domain B and the range A and is defined as
