Math Trick for Fast Multiplication
ฝัง
- เผยแพร่เมื่อ 24 ก.ย. 2019
- #fastmathtricks
#mentalmath
#mathtrick This math trick is pretty easy to do, and can be done in your head faster than a calculator.
This trick only works when multiplying numbers that both end in five. A couple of simple steps and you're done!
In addition, the mathematical reasons why this trick work are simply explained at the end of the video.
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I’m so happy you started uploading again! My GCSEs started this year and these videos are a massive help
I love this trick! It's so simple and easy to remember + the fact that it works with numbers with 3-digit numbers as well as 2-digit is really helpful. Keep up the good work and thanks for all the help on your channel!
Another way of selecting an answer in multiple choice questions is-
Question: multiply 10x+5 and 10y+5
Steps- Add X+Y...(a) if answer is even then our eventual answer to (10x+5)(10y+5) will have 25 at the end...(b) if the answer is odd then our eventual answer will be 75
This way people can eliminate answer choices and select the answer wisely in shortage of time
I've never understood multiple choice math or calculus tests.
Thank for all you done you helped me through 4rth to 5th grade thank you for everything
Knowing why it works is a must for me. Thanks for sharing. 💚
As always brilliant
Thanks
Wow I got a test coming and this is what I get amazing!
👏👏👏
Big thanks to you
Loved the trick
It sounds like your voice is in constant slow motion
Mate, thank so much
Awesome, thanks.
You teach me a lot thanks
Thank you
I liked the explanation at the end but a visual representation may help people to see what the algebra is actually. doing A rectangle of 35 on one side and 65 on the other can be reduced to a rectangle of 30 x 60 with a band of 5 surrounding it. This band consists of two rectangles (5 x 30 and 5 x 60) plus one square in the far corner (5 x 5). So the total sum/area is:
(30 x 60) + ((30 + 60) x 5) + (5 x 5) = 1800 + (90 x 5) + 25 = 1800 + 450 + 25 = 2275.
It was looking at problems like this that helped the arabs to derive algebra; to describe what they were doing.
very good skills.. thanks
Keep a good work
Good job
Great.thanks
Very good.
Love it,my 10 years and 8 years will love it and they will be showing off at school 😉 like usual.
U r a great math teacher!
I LOVE THESE
You still upload alot so great
How awesome!
Very lovely
Failed maths so now im here :(
Such a massive help!! Thank you for these step by step guides!
Thank you for coming back!
A very handy method. The proof is an example of the benefits of playing around with numbers and discovering new truths about arithmetical patterns! I'm sure that when Pythagoras discov
vered the right angle triangle equation it was as a result of just doodling around with two squares, rather than from an effort to prove an established theorem.
can you make bodmas ,exponents ,roots ,functions and relations because my son enjoys learning your math tricks and they have helped him improve in maths
Nice
There are nice tricks
Your a wizard math
The math nerd in me is totally amazed and enthralled by this dark magic trick 🤓 I'm going to use this every time I have to multiply two numbers that happen to end in 5 in my everyday lif-- oh wait, now I'm sad.
I love Maths and Math teachers
Math trick!!
the easier way without multiplying by 100 and avoiding decimals:
45
x 95
-------
4 x 9 || 5 x 5
36 || 25
+ 6 5 ----> add the average of 40 + 90 (65) and put just before the unit's place
----------------
= 42 75
135
x 85
-------
13 x 8 || 5 x 5
104 || 25
+ 10 5 ----> add the average of 130 + 80 (105) and put just before the unit's place
----------------
= 114 75
Hey...can you do Constant of Proportionality, please and thank you?
Tou are the best in the world
Bro how does anybody dislike this kind of stuff??
Yes
Love this channel. You sound like a stoned maths teacher but great content
You brighten my dimness
Well no matter how long it is since you done one of these videos I'll miss em if it was every day
Can us do a video of using a square root in ours calculators please!!!
I must point out that you missed explaining how you arrived at "add 25" in the first problem. Clearly it is 5x5 but you need to explain that and not assume everyone saw that. I actually thought you were going to work out the problem by multiplying 35 x 100 then subtracting 35x5 which is all mental arithmetic. Something my mum taught me about 60 years ago. Not seen your method before and I think it works better than mum's. Very interesting. I am really enjoying your videos. Thank you.
60!
For the last equation. Just do it like the others. 6x3=18, 6+3=9, Divide by 2= 4.5 .. 18+4.5= 22.5, Then add your 5x5=25 AND the answer is 2275. Right?
I learned lots things!
pgood. because the no. of multiplications is less! (compared to regular no. of four multiplications) nice
** who expected me being 11th grade student in CBSE was looking for this video
Huh neat
Opps! is this for 4- 12?
why u do average? is this trick work for 45X96?
It would be great if you could add more nursing drug calculation😊
that's not an aussie accent, that's your voice after eating a meatpie at the AFL
Hi love your classes as it helps me in high school. I am confused with say doing 127 * 86 in my head. So by your trick the first part is 128*8=96 then add (12+8)/2 which I get 106. Then 106*100 + 42 = 10642 but this is wrong. Can please explain. Thank you
It only works if the numbers end in 5 (both being half of ten is why it works).
10*10=100
5*10=50
100/50=2
what does ( Av ) mean
man im looking for a trick i knew like i could multiply 6.748.123 times 3.968.436 in under a minute and very easy but i forgot what it was
🥰
LOVE YOU DAD 💙💙
Hey bails....love you too son :)
Keep up the great videos.
@@baileyrichardson5145 thanks i try my best
Sounds like the turtle from FInding Nemo.
45x95 can you solve using this method
3:17 ?
35x95= 35x100 -(5x35) = 3500-175= 3325
The spherical trigonometry calculation for globe earth curvature is 8 inches per mile squared....this is demonstrably non existent 😎
Then demonstrate it.
Damn
Sr your system does not work with 23 x 33
35×26
Dude I could of used this when I was in the third grade :/, I guess better late than never.
Loved the trick....you lost me with explanation.....sometimes it’s best not to know why! Love your videos....they help me do my grandsons homework. Thankyou
85X33=?
another wrong method by applying i am getng ok try to solve this
42*43=1806is actual answer but infact iam gettinh 2006
Only works wuth the nunber having 5 as last digit !!
❤️
The trick worked alot but the end of the explanation confused me. I got 99.5% right.
first in maths 36/50 secondin maths 50/50
35 x 65 =
3x6 = 18
Av. (3+6)/2 = 4.5
18 + 4.5 = 22.5
22.5 x 100 = 2250
2250 + 25 = 2275
Comment🤣
Thank you for it!
@@tecmath no worries. Great vid👌
I was doing fine until the explanation of why this works- now I'm totally confused with the XY explanation and don't understand. Glad everyone else understands, but, you lost me totally with the XY explanation.
No answer at the end. 🤦🏼♂️
class?
Doesnt work with 82x75
Inhale My Farts only works y 5 end number
You lost me after 3300. I have know ideal how you got 25 Not clear at all.
Kicking it with Kim KIWK the 25 is just the 5x5 in the ones place
Really? Even though he said where the 25 came from multiple times?