Math teacher reveals the easy way to multiply ANY number by 11 in just seconds

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A Canadian math teacher has amazed TikTok users with her incredibly easy trick of multiplying any number by 11.

The teacher, who has earned a huge following on social media platforms under the moniker silent math, regularly shares math help on her channels, including a few quick tricks to make algebra a breeze.

And in one clip that has seen 25.5 million views, she explains how to multiply any number in seconds, without the use of a calculator or pen and paper.

Wow! A Canadian math teacher has amazed TikTok users with her incredibly easy trick to add a random number to 11. to multiply

How: First you separate the digits of the number you are multiplying by 11 and then add those digits together

How: First you separate the digits of the number you are multiplying by 11 and then add those digits together

Ta-da!  That sum is then inserted between the two original numbers for the final answer

Ta-da! That sum is then inserted between the two original numbers for the final answer

silent math, which is based in Ontario, has been teaching math for over 10 years and offers paid tutoring online — as well as lots 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 solve 11 x 32, you’re separating 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: Ontario-based Silent Math has been teaching math for over 10 years and offers paid online tutoring courses – as well as lots of free help on social media

The Pro: Ontario-based Silent Math has been teaching math for over 10 years and offers paid online tutoring courses – as well as lots of free help on social media

The 11s trick video has earned 3.5 million likes, as well as thousands of shocked and appreciative comments.

‘WHERE WAS YOUR WEHN I FAILED MATHEMATICS?!’ one commentator asked.

“Teachers could have just taught us this…” wrote another.

Others came up with their own helpful tips, such as pointing out what to do when the two numbers add up to 10 or more.

For example, with 11 x 46, 4 plus 6 is 10. The 0 of the number 10 would go between 4 and 6, while the 1 of the number 10 would be added 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)

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 and then subtract it from itself,” she says.

How: For 99 x 18, for example, you would multiply 18 by 100, which comes out to 1800.  Then subtract 18 from that total, which gives you 1782

How: For 99 x 18, for example, you would multiply 18 by 100 to get 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.

Respond to a video in which user @munchie.michelle does the super-fast math in her head, Silent Math explains how others can do it too.

“The trick to multiplying by 99 is to multiply the other number by 100 first and then subtract it from itself,” she says.

For example, for 99 x 18, you would multiply 18 by 100, which comes out to 1800. Then subtract 18 from that total, which gives you 1782.

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