2006-06-23 17:30:17 · 6 answers · asked by Stompy 2 in Education & Reference ➔ Other - Education
There is a book called "the Trachtenberg System" which explains a lot of computational shortcuts you can do in your head. It's probably in your local library.
Here's an example of how to square a 2-digit number
Rules:
1. Square the second digit
2. Multiply the two digits and double
3. Square the first digit
Example:
34^2 (^2 is used for the "squared" symbol)
6 4^2 is 16; write 6, carry 1
5 3x4x2 is 24, +1(carry) is 25; write 5, carry 2
11 3^2 is 9, +2(carry) is 11
1156
34^2 = 1156
2006-06-23 18:04:31 · answer #1 · answered by roxburger 3 · 4⤊ 1⤋
Yes:
Harry Lorrayne wrote a woderful book, Miracle Math", years ago that teaches rapid addition, subtraction, multiplication, and division. It's long out of print, but you can buy it second hand at www.abebooks.com or on E-Bay.
2006-06-24 01:20:51 · answer #2 · answered by Dan S 6 · 0⤊ 0⤋
the magical method of the great invention- the calculator. the way i see it is why learn math if you can have a calculator with you at all times? tell that to your math teacher and see what he or she says!! lol.
2006-06-24 00:35:47 · answer #3 · answered by Awesome Kai 3 · 0⤊ 0⤋
a calculator
2006-06-24 00:32:32 · answer #4 · answered by Anonymous · 0⤊ 0⤋
practise make perfect
2006-06-24 00:33:15 · answer #5 · answered by macausite 2 · 0⤊ 0⤋
cloning.
2006-06-24 00:36:57 · answer #6 · answered by fybwags 1 · 0⤊ 0⤋