Easy Multiplication Trick you will Actually Use

This multiplication trick is so easy - but you probably don't know it...because it doesn't get taught.
That's OK - youtube and tecmath has your back - with this, the easiest multiplication trick you were EVER taught in school!

Here is THE mental multiplication lesson playlist - progressing you through your mental multiplication.

[mirir.]

I feel so lucky i found this legend when I'm still in school. You really did made me LOVE math. Thank you SO much! I feel like I'll owe you forever.

[mamipautu]

Him: Solve this in 3 seconds.
My brain: Don't even bother.

[jawanjelly]

After 12 years you still upload. What a legend.

[itsgettingold]

You know what's magic? Your VOICE. So easy and pleasant to listen to. You look really great on the radio, as they would say back in the day.

[olspanner]

Where were you when I was in school? Silly question I know, I'm now goin' on 82 yo. lol

[anonymouscritic]

To me this seems fairly difficult to do still. I always just simplify the equations looking for the easiest way to do so. For 21 x 14 that means first calculating 20 x 14, which is 280, and then simply adding another 14 to get 294. For the 15 x 18 I just calculate 15 x 20, which is 300, and then deduct 2 x 15, which is 30, to get to 270. Now the last one seems to be the most tricky, but it really isn't. Just start with 10 x 16, which is 160, and then add 48 (3 x 16), which accumulates to 208.

[napoleonnz]

My method: 21 x 14: multiply 2x14 = 28, therefore 20 x 14= 280. Then add one more 14 = 294. Easy!

[GetMeThere]

for one's with a small digit, like 21 x 14, I just do 20X14 then add another 14. If it was 19X14 then it's 20x14 - 14. You method is nice for the "middle sized" digits.

[sjhewlett]

Absolutely superb. Why was I not shown this in school. You’re awesome!

[juanwalker]

thank you so much for these! I just started college and wanted to do some deep research and tutoring on math, this channel is AMAZING! God bless you and keep up the good work!!

[cityofoaks]

I'm enjoying these. We're trying to get a 3rd grade student interested in math using your methods.

[winnepeterson]

Math has always been like a fun puzzle to me (I’m 71) so this is really great. Don’t remember how I stumbled across your channel the other day but I’m sure glad I did.

[skirtonbear]

I didn’t understand what you meant by how far the third problem was from ten until you showed it in process. Now that you explained it, I need three more problems to know if I learned it.
Thank you. I’m dyscalculic and struggle with keeping any numbers in my head, so tricks like this do help because it shows me what is going on with the numbers—that, I can do: comprehend. It’s the calculating that fumbles.

[inthebayarea]

Wow, I am just blown away by the videos I have watched so far. I intend to watch all your videos, EXCELLENT, you are the best teacher ever. Thank you so much for sharing your videos!

[chris]

tectmath has break the career of our math teachers, btw thank you so much for this video!

[apollo]

Your channel is a very powerful tool. Thank you for teaching this to all of us.
Math that’s being taught in elementary schools today is so confusing to the students

[rambabupiridi]

Your tricks are so easy and fast! These techniques are out of the world.

[adahobbs]

Thank you mate. Keep the content coming please this is gold. I love the way you go over things twice for charity. You are a star!

[robertwaid]

Thank you for the tips and tricks! But for my own issues, I'll still do the long form. Maybe not in my head, but definitely on paper if available, or on a calculator. Please keep this good stuff coming.

[Trapstar_adott]

Yo I came BAKC to tell u thank u so much for helping me since 4th to 11th grade I don’t know what I would’ve done without your channel