It is in Spanish because it is my native language but it is also in English.
But I do most of my tricks (actually all of my tricks) from left to right and not from right to left.
It’s our choice to go from right to left or left to right. Either way works out.
I haven’t seen a large number of presentations on Vedic Mathematics, therefore I do not know whether people go from left to right or right to left.
Atleast I go from left to right.
Hi Nipun Ghanathe,
Here are some answers to your questions.
I have written a lot about mental division. Do a search.
I do not memorize them. With a little bit of practice the 100 complements just enter your brain.
If I think of the complement of 69, 31 immediately pops up.
Practice this a bit and I am sure this will happen to you too.
Just try both and see whats fits better. The second approach has the added advantage of geting the ‘dimensions’ right.
However I use a slightly different way of calculating 58X72, still using cross multiplication. Here it goes:
You can think of 58 as 50 + 8 and 72 as 70 + 2 and do the cross multiplication.
However you can also think of 58 as 60 - 2.
If we use | as the separator between the tens and singles, then 58 becomes 5|8 and 72 becomes 7|2.
58 - the way I do it - then becomes 6|-2.
Now we do the cross multiplication the exact same way:
6 | -2
7 | 2
_____ X
Step 1: 6x7=42
Step 2: 6x2 + 7x-2 = 12-14 = -2. 420-2 = 418
Step 3: 2x-2 = -4. 4180-4 = 4176. Done.
This way, the sub calculations are done with smaller numbers and are thus easier to do and easier on the brain.