Hi,
Should I learn to calculate this (66*38) in my head, or is it okay to write
66*38 (40 - 2) = 2400+240 = 2640-132 = 2508.
Writing it down takes me 30 seconds. I guess it has to be reduced, but how quickly do you think that this should be solved?
Any help would be appreciated! :)
/Nils
Hi Nils,
the approach is correct and I think you can reach half of the time with it by practicing a bit. Preplounge math tool is super helpful and I also love this Youtube channel (here a video for fast multiplications): https://www.youtube.com/watch?v=PYrgjMubh-c
Hope it helps,
Antonello
(edited)
Hi,
You need to develop 3 calculation skills:
1) Learn how to multiply double-digit numbers (https://www.youtube.com/watch?v=6ndkkPZYJHo).
2) Learn how to work with zeros. The best way - always use 10^power instead of zeros
Example:
300x9000 = 3*10ˆ2 x 9*10ˆ3=3x9*10ˆ(2+3)=27*10ˆ5
Handwritten it looks not that complicated. If you get used to writing all the numbers that way, you will never lose zeros and all multiplications/divisions will be replaced with + or -.
3) Additionally, I suggest to learn how to make the division mentally:
Learn the division table up to 1/11 (i.e. 5/6 = 83.3%). It will help you calculate any percentage problems
Finally, use math tools (Mimir math for iOS, Math tool on Viktor Cheng website) to practice. Train, train, and train again
Good luck!
Hi Nils
The more you practice the more ideas and appraoch you willl come across that would reduce the time you might be taking to calculate.
Herea are a few, but to master these one has to practice regularly
1. Simplify the numbers 66*38 = 2*3*11*2*19
Learn few tricks eg. multiplying my 11 it's the easiest ... 2*3*2*11 *19 = 209*3*4 = 627*4= 2508
2. Learn and practice vedic calculation techniques for two ot three digit numbers. These are very very simple and you would be able to marster these with few days practice.
Yes, Practicing by writing down the calculations will help you sharpen the visualization of numbers and also trigger fidentifying faster techniques.
Hope this helps. Incase you need any help with vedic calculation techniques please free to connect. I developed a pattern based technique for multiplication of large numbers during my engineering days that pretty easy to execute once practiced, can share with you its derivation and application.
All the best.
Kshitij
Hi,
It is also okay to write it down, as long as you get to the answer to this particular equation in 10-15 seconds or so. I would break 38 into 30 and 8 when doing the calculation.
Best,
Deniz
