Learn more fast multiplication techniques to do in your head in this free video series.Get mental math tips from these online tutoring lessons. Expert: Sean Salazar Bio: Sean Salazar has taught in both Schools and Community Centers, specializing in Math and English. Filmmaker: sean salazar
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How to Do Math In Your Head : More Fast Multiplication Techniques
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look up and learn the abacus it is by far the easisest way to actually calculate these numbers. i heard that in a year or so u can actually be able to visualise it in your head so even more helpful
you just make one. I’m stupid, and I can come up with one for almost any relating group of numbers.
theres this exam that you must do in your head for 5 mins 20 question…they give you like…ex: 345+531 or 23×63.. all multiply and plus only in 5 mins.. in your head no scratches on the side of the paper.. this method cant help..its actually a dealers exam in a casino…any one can point me a video where to go for does example i just gave?
Thanks for pointing it out – I know, I was kinda careless when I wrote that
0:12 … he already made an other video, these are “more” fast multiplication techniques .. not “faster” ones than the others.
that method doesnt work well unless the numbers youre multiplying are actually in the 90s
hah! tell me how are you going to get the answer in 87×75 when after performing that technique which gives you 62 you have to do it again to have your second answer because it gives you 13×25 then you’ll be back at 87×75!!!!
I have one too for 90. For the first two digits you times 9_X9_ then add the latter two digits, and it will always be the third number. Example 93X93 = 86_._ The product of the forth digit = 3X3 or 9. For the third, it’s the sum of the last two digits – 10, but you have to be careful bc sometimes the product is over ten (of the other two), and you have to add ten. it’s a good way to chech your answer. I’ve been doing the first two digits w/o realizing it awhile.
Ah, I’m sorry – that’s my mistake, then.
Doesn’t sound that good to me anyway, though… “more multiplication techniques” wouldn’t be confusing, I suppose.
threy had another clip called “fast multiplication techniques” So now they are giving you more of them.
Besides, “more fast multiplication techniques”… what would you say of the word “faster”?
its useful if you dont have a calculator on you
you probalbly did it wrong
lol, what ever happened to cross multiplication?
Vedic math?? What on earth do you mean?
That’s basic knowledge everyone must obtain.
If counting 72*11 is magic, then 72*10+72 is probably not! I like the idea of calling this “vedic”, but that’s something everyone can master, and usually without memorizing all these tricks.
that’s not fast at all!i can do the “conventional”way much quicker.
Ahhh! You can apply this method with a different reference number. He uses “100″, but you could use 20, 50, 100, 200, 500, 1000, etc. It’s neat but not completely useful.
Your system only works for numbers between 90 and 99, for 80 to 89 you only keep the first digit of the subtraction, and below that your system completely falls apart – for the amount of times I have ever needed to multiply any such numbers in my entire 39yrs on earth isn’t worth the effort required to learn this – and I’m an electronics engineer, I use maths every day. The easiest method I know of is to multiply up in 10′s and units adding as you go, far easier and more accurate.
thank you for acknowledging the difficulties of a low number but is there any remedy???
Also what if the number(s) were over 100??? plz reply and great vid!
I never got that. Does the answer always have four digits?
you need to carry the 3 across ….62 & 345 add the 2 & 3 together 6545
This is vedic math. You can get a better explanation of this method from youtube by search vedic math(indian).
77×85?
I tryed it and it didn’t work.
thats a long way to of doing it. There is a shorter way
960 just add a zero at the end and multiple the rest by 4