Percents Hack ---- Math Shortcut Tricks

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[tomh.]

Another good, quick way to calculate 20 percent of any number: Start by figuring 10 percent of that number (just move the decimal point to the left by one place), the double that answer. Here's what this looks like in the sample question featured in this video: Ten percent of 20 is 2, and 2 X 2 = 4. Then repeat the same process for 4: 10 percent of 4 is 0.4, double that is 0.8.

[en]

Wow!!! You’re a genius! Thank you so much for sharing!!

[Mikeymyxer]

Thanks for the help my math is bad but these videos help

[philv]

How i do it is i move the decimal pt over to get 10% is 2. So thays 4. Repeat. 0.4 doubled is 0.8

[andrewschaeffer]

Why do you do everything the long way. 10% of 20 is 2; double it. Then 10% of 4 is 0.4; double it. I did that in seconds

[jayeshsaroj]

Did in less then 10 sec in mind.. vedic😂

[bubbleslovebird]

I have a learning disability. All this does is give me anxiety. 😓

[ВладимерМедведев-цм]

Я F*** извеняюсь, но этот премер можно решить в уме, если округлить 20% до 2 то можно сказать что этот премер равен 2³÷10 что для меня гораздо проще чем выполнять те действия что показанно в видео
P.S. И это что премер 6 класса?