Random Math Question

[Miike012]

1. The problem statement, all variables and given/known data

I am really tired of useing a calculator for small calculations. Are there any books out there that teach you how to mentally calculate quicker?
This would save me time on tests and make things more efficient so if there are any books please let me know. thank you.
2. Relevant equations



3. The attempt at a solution

[berkeman]

1. The problem statement, all variables and given/known data

I am really tired of useing a calculator for small calculations. Are there any books out there that teach you how to mentally calculate quicker?
This would save me time on tests and make things more efficient so if there are any books please let me know. thank you.
2. Relevant equations



3. The attempt at a solution

I really enjoyed this book:

"Rapid Math Tricks and Tips", by Edward Julius http://www.amazon.com/Rapid-Math-Tricks-Tips-Number/dp/0471575631/ref=sr_1_1?ie=UTF8&qid=1299870206&sr=8-1

Years after reading it, I still use several of the tricks almost daily.

[darkchild]

I really enjoyed this book:

"Rapid Math Tricks and Tips", by Edward Julius http://www.amazon.com/Rapid-Math-Tricks-Tips-Number/dp/0471575631/ref=sr_1_1?ie=UTF8&qid=1299870206&sr=8-1

Years after reading it, I still use several of the tricks almost daily.

I used that one as well, although I think that it was a later version because the book was yellow. I also found it useful, but a large proportion of my mental math skills came from practice calculating things. You start to recognize patterns after a while.

[Miike012]

Great!.. Thanks alot I will check it out.