can anyone tell me how to do fast maths calculations without the help of a calculator?

Answer 1

First, make sure you know the basic of whatever you are going to do, then practice, practice practice. Take tests, and within a month, you will probably be more competent at it.

Answer 2

Addition:
Don't add columns, add pairwise
Working left-to-right is faster than working right-to-left once you have practiced it
Subtraction:
Again, work left-to-right
sometimes adding 9's complement is faster than subtracting.
Multiplication:
memorize tables up to 12x12
memorize squares up to 25
Many times factoring is faster than straight multiplication:
47*5 = 470/2 = 235
16*43 = 8*86 = 4*172 = 2*344 = 688
6*17 = 3*34 = 102
look for tens ± 1
19*23 = 460 - 23 = 437
It works for 10's ± 2 also, ± 3 gets a little tougher
Look for numbers separated by 2 or 4 and use difference-of-squares to multiply:
24*26 = (25-1)(25+1) = 625 - 1 = 624
Finally, Vedic or Basque multiplication (left-toright again):
43 x 79 =
40 + 3
x70 + 9
2800
+210
3010
+360
3370
+27
3397

Division has the fewest speedy shortcuts:
Whenever possible multiiply by reciprocals:
432/5 = 864/10 = 86.4
Factor dividend and divisor and cancel whenever possible.

Answer 3

A) Try to remember the followng tables by heart both forwards and backwards:

1. whole number (2s, 3s, 4s....18s, 19s, 20s)
2. fractional (1/2s, 1/4s, 1/3s, 1 1/4s, 1 1/2s, 1 1/3s etc.)
3. squares (2squared, 3squared, 4 squared etc.)
5. cubes (2cube, 3cube, 4 cube etc.)
6. number raised (2square, 2cube, 2raised to power 4 etc.)
7. number times table (2squared, 3 cube, 4raised to power 4 etc.

B) Try to remember by heart both forwards and backwards the prime numbers (1, 2 3, 5, 7, 11, 13,17, 19, 23 until 3,000) This helps a lot when deciding whether a number is divisible easily or not.

C) Remember some simple rules:
1. All even numbers are divisible by 2
2. All numbers whose right most digit is either 5 or 0 are divisible by 5
3. All numbers whose right most digit is 0 are divisible by 10
4. If the net sum of the digits in a number is 9, it is divisible by 3 as well as 9 eg 618543 [6+1+8+5+4+3 = 27 => 2+7 = 9]

D) There is a fun game that you may try. It goes something like this. You lok at the registeration number of any passing vehicle and try to make an equation in your mind.

Example 1: Vehicle registeration number is AAB3273. So take the number 3273 and try to form an equation eg. 3√27=3
Example 2: Vehicle registeration number is LXY1073. So take the number 1073 and try to form an equation eg. 10=7+3

There will be many times that you will fail but continue the game. You can make the equation until you see the next Vehicle registeration number. Needs realy very fast thinking and computations. I assure you that this game is quite difficult in the begining but once you get the hang of it then Vow !!!

Answer 4

1. Yes 2. Basic Math, Algebra, Trigonometry, Calculus, Differential Equations 3. No 4. Yes 5. Yes 6. Yes 7. Yes

Answer 5

well it is just practice. when u get a simple maths calculation just try not using the calculator and try it in ur mind and then see whether u get the rite answer or not?

Answer 6

Check out a book called "Mathemagics" by Benjamin & Shermer. It will help you speed up your arithmetic calculations considerably.

Answer 7

yes you can do fast calculations without calculator by abacus
just try it

Answer 8

There are tricks to doing some things... check out a book or website on "mental math".

Answer 9

the answer to your question is only vedic maths. try the tricks and practice those. surf the site "www.vedicmaths.org" or "www.magicalmethods.com" or "www.vedamu.org/Mathematics/course.asp "
i think ur search will end here.

Answer 10

go to www.math.com and go to speed-math