2006-09-21 20:51:28 · 22 answers · asked by John 1 in Science & Mathematics ➔ Mathematics
I think you have the answer, but thanks for intro to Vedic Maths.
2006-09-21 22:28:03 · update #1
Unfortunately, there is no quick way, only preferences in method. In the olden days, before calculators, enterprising individuals would publish tables of numbers so they only had to calculate them once, and thereafter look them up. Many are still "in print". The link below gives factorials up to 52!and combinations thereof:
http://www.rpbridge.net/7z78.htm
(quite useful for calculating odds for card games)
2006-09-21 21:23:18 · answer #1 · answered by Helmut 7 · 0⤊ 1⤋
Since all the integeres in the factorial are multicable
then first remember some multiples
ex as
5*4*3*2*1 =120
7*6*5*4*3*2*1 = 5040
10*9*8*(7*6*5*4*3*2*1)= 5040*720=50400*72=3538800
2006-09-22 22:53:18 · answer #2 · answered by c2 brahmin 2 · 0⤊ 0⤋
Another calculating tool besides the calculator is the abacus. You might want to try taking up mental abacus courses.
Other than that, all you have to do is just practice, practice and more practice.
I hope this will help x)
2006-09-21 23:20:48 · answer #3 · answered by b0b0link 2 · 0⤊ 0⤋
You need to group numbers together to make nice products. For example, 5! = 5*4*3*2*1 = (5*2)*(3*4) = 10*12 = 120
Is that what you need?
2006-09-21 20:55:58 · answer #4 · answered by Isaac 2 · 1⤊ 0⤋
you ought to use tables in books, yet considering calculators have been invented, maximum folk don't have those. you are able to calculate the sine or cosine of specific angles from specific specific triangles. See my source.
2016-10-17 10:40:09 · answer #5 · answered by ? 4 · 0⤊ 0⤋
Just do the multiplication in your head. That the best way
but beyond the number 10, the numbers get quite large but it can be done.
2006-09-22 10:51:49 · answer #6 · answered by Anonymous · 0⤊ 0⤋
u shant use cal. it only makes ur brain idle.practise sums wene'er u get time & should practise those of advanced standard.always keep juggling with numbers,big numbers like finding squares.practising vedic maths is a good idea.always have courage, strength of mind and use ur brains. ..................................................now can u calculate the dist. travelled by light in 1 yr!...mentally!
2006-09-21 21:51:47 · answer #7 · answered by sayantani 1 · 0⤊ 1⤋
Learn Vedic Mathematics. It might work.
2006-09-21 20:59:56 · answer #8 · answered by Anonymous · 1⤊ 2⤋
By using your brain! Mental arithmetic - ie stop using the calculator altogether - they only teach you how to push buttons, not how to work problems out for yourself. Millions of over 40's will agree with me.
2006-09-21 21:03:13 · answer #9 · answered by cymbalita 5 · 1⤊ 1⤋
You should know your times tables like the back of your hand. That should help calculating mentally.
2006-09-21 21:07:58 · answer #10 · answered by Hardrock 6 · 0⤊ 1⤋