Three-digits square trick
Check out the main channel @polymathematic !
If you're strong at two-digit multiplication, you can leverage that into this trick for squaring three-digit numbers ending in 5.
Subscribe: https://bit.ly/polymathematic | Enable ALL push notifications 🔔
There are only two steps to this trick, and the first one is super simple. First, write down 25. Any number ending in 5 will end in 25 when you square it. The second step is where being strong at two-digit multiplication comes into play. You have to take the first two digits of the numbers and, treating it like its own two-digit number, multiply it by the number one greater.
The area model for multiplication gives a great way to understand why this trick works.
#mathtricks #numbersense #mentalmath
Follow Tim Ricchuiti:
TikTok: / polymathematic
Twitter: / poly_mathematic
Instagram: / polymathematicnet
Reddit: / polymath-matic
Facebook: / polymathematic
Watch more Math Videos:
Math Minis: • Math Mini
Math Minutes: • Math Minutes
Number Sense: • Number Sense (UIL / PSIA)
MATHCOUNTS: • MATHCOUNTS