If you're willing to put in the time to learn these tricks and to practice, you really can build your ability to do math in your head, and this will help you a lot in life. It's a lot like weight lifting. One essential trick: learn the inverses of all the small integers: 1/2 = 0.5, 1/3 = 0.333..., 1/4 = 0.25, etc.
This book is definitely pretty good for learning the tricks and for practicing.
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FollowBefriend (6)85 threads969 comments 44 maleEgg Harbor City, NJ
If I do math in my head, just think of all the computer and calculators on the unemployment line.
Don't Think! Keep our computers working!