Fast Mental Multiplication Trick - multiply in your head using base 10

This mental multiplication trick uses the idea of a third number - a base number - to help us multiply two numbers in your head. This series of videos first looks at multiplying numbers near 10 using base 10. The second video looks at multiplying using base 20 and 30. The third video looks at how to apply this mental multiplication trick to numbers near 50. The forth video the investigates ho to easilt mentally multiply numbers near to 100. Continue your mental math multiplication abilties here!

[massojupiter]

Schools teaches memorization. This guy just taught me how to save time while still using my brain and avoid using a calculator. I just learned something so useful in like 2 minutes meanwhile in school it takes years to learn something that you'll actually use in your life

[vickireynolds]

I'm 65, and a little over 10 years ago, I was diagnosed with dyscalculia, which is a math specific learning disability. If only I had known this as a child, I would have felt a lot better about not getting math! But, your explanations also make more sense than any I remember in school! Thanks!! I'm watching math without breaking out into hives!!🤔😂😂👵

[somchitleang]

Where's them math at?! Not scared of you anymore!
Now I can pass this on to my grandkids. I'm gonna sound like a genius.
YES! Thank you very much.

[justcallhoward]

I have to express my gratitude to you for all that I've learned from your teaching videos. I deeply appreciate the relaxed pace and concise yet easy techniques you employ. I have suffered for years from a deep anxiety regarding math. My mind locks and my thought process borders on paralysis when it comes to calculations. Thanks to your vids, that is no longer the case. I can't express adequate thanks to you.

[Beevreeter]

Fascinating but my calculator might feel rejected

[AussieAnnihilation]

amazing, im learning more in 1 hour on your youtube than i did throughout all of my schooling life.

[dave]

I really struggled with maths at school, and managing to get ungraded in my maths exam, fast forward 40 years to now and I can confirm my confidence has 100% grown

[bogdanescu]

Pretty cool trick. I've always used the method of splitting the multiplication into 2 easier ones and it worked fine for 30 years and counting: 15 x 13 = 15 x 10 + 15 x 3 = 150 + 45 = 195

[cottoncandy]

Why the heck don't we learn this in school?

[jalle]

My god this is brilliant. My middleschool class is gonna love this. Thanks!

[BeardyBaldyBob]

What the hell?!
All the way through high school and 5 years at uni and I never was shown this technique?! 🤯
It's so simple and intuitive!!
I'm actually kinda angry I was never shown this at school.

[Kitsunary]

This reminds me of the time when I was multiplying numbers out loud and broke down one of the numbers to make the multiplication easier and someone at the same table was surprised you could do that.

If school did a better job of explaining how basic math worked, they could easily teach simple tricks like this to speed up mental arithmetic.

[iTzLondon]

Why are we not taught this in school??? Freaking genius

[ClnRX]

I'm 39 years old and only learning about this today. Thank you for being an awesome teacher.

[meekawolff]

I have a nephew who hates math because he says it's too difficult. I love math because I was lucky enough to have an excellent math teacher who made learning math fun. You remind me of my math teacher. I am positive that once my nephew watches this video he won't hate math anymore. Thank you 💕

[XBQV]

I was thinking this was clickbait, but it really is a ridiculously good multiplication algorithm!

[trillazgurlps]

I want to thank you so much for this SIMPLE method, I suffer from mild dyslexia & im not a wizard in multiplication or division, I couldn't figure out for the life of me how I could do every other piece of math in the book in different areas yet my memory wasn't wired to deal with neither operation (im in my 2nd year of college). It was how I was trying to handle it, outgrowing lattice, & tired of the egyptian math, so again I want to thank you not just for me but for ALL OF US because there are soo many of us that feel inadequate being some kind of smart yet having issues handling these two operations. Its truly a blessing to share it regardless of the history behind it! :-)

[chynthiayani]

Please continue on what you're doing, do not stop! Its really helpful thank you

[realtoast]

Yesterday, I had a 2-hr drive home. Spent most of the ride mentally working this method in my head with random problems and checked results with Siri on my watch. Funny how time flew. I was thoroughly entertained! With practice, it becomes easy to immediately get that 10x without any real thought, and also easy to instantly generate the product of the two "more than / less than" numbers without much thought. The longest part is the final addition / subtraction.

[Tei_]

I seriously should’ve been taught this in elementary school. I learned more in 10 minutes than I did in 3rd, 4th, and 5th grade.