Uploaded September 2019 | Updated September 2026, 2 weeks ago

---

#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.

To support tecmath on Patreon: patreon.com/tecmath To donate to the tecmath channel: paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: paypal.me/tecmath?locale.x=en_AU
To support tecmath on Patreon: patreon.com/tecmath
To buy tecmath mechandise: teespring.com/stores/tecmath-store