A Canadian math teacher has amazed TikTok users for her incredibly easy trick for multiplying any number by 11.
The teacher, who has earned a huge following across social media platforms under the name Silent Math, frequently shares mathematics help on her channels — including a few speedy tricks to make algebra a breeze.
And in one clip that’s been viewed 25.5 million, she breaks down how to multiply any number in just seconds, without the use of a calculator or pen and paper.
Wow! A Canadian math teacher has amazed TikTok users for her incredibly easy trick for multiplying any number by 11
How to: First, you separate the digits of the number you’re multiplying by 11, then add those digits together
Ta-da! That sum is then inserted between the two original digits for the final answer
Silent Math, who is based in Ontario, has been teaching math for more than 10 years and offers paid tutoring courses online — as well as plenty of free help on Instagram, YouTube, and TikTok.
In a video shared on March 29, she shared the ’11s trick,’ which makes it easier to multiply another number by 11.
First, you separate the digits of the number you’re multiplying by 11 — so if you’re solving for 11 x 32, you’d separate 32 into 3 and 2.
Then you add those numbers together. For example, 3 plus 2 is 5.
Finally, you put that sum between the two original numbers — so 5 goes between 3 and 2 for 352 — which is the result for 11 x 32.
The pro: Silent Math, who is based in Ontario, has been teaching math for more than 10 years and offers paid tutoring courses online — as well as plenty of free help on social media
The 11s trick video has earned 3.5 million likes, as well as thousands of shocked and grateful comments.
‘WHERE WERE YOU WEHN I FAILED MATH?!’ demanded one commenter.
‘Teachers could have just taught us this…’ wrote another.
Others chimed in with their own helpful tips, like pointing out what to do if the two digits add up to 10 or more.
For example, with 11 x 46, 4 plus 6 is 10. The 0 from the number 10 would go between the 4 and 6, while the 1 from the number 10 would added to to the 4, making the total 506.
Silent Math has shared other helpful tips, including how to multiply any number by 99. She replied to user @munchie.michelle, who did the math in her head (pictured)
‘The trick to multiplying by 99 is to multiply the other number by 100 first, then subtracting it from itself,’ she says
How to: For example, for 99 x 18, you would multiply 18 by 100, coming up with 1800. Then, subtract 18 from that total, which gives you 1782
Silent Math has shared several other helpful tips that have gone viral, including how to multiply any number by 99.
Replying to a video in which user @munchie.michelle does the super-speedy math in her head, Silent Math breaks down how others can do it too.
‘The trick to multiplying by 99 is to multiply the other number by 100 first, then subtracting it from itself,’ she says.
For example, for 99 x 18, you would multiply 18 by 100, coming up with 1800. Then, subtract 18 from that total, which gives you 1782.