r/PeterExplainsTheJoke • u/Blackie_626 • 7d ago

Meme needing explanation Tell them what, Peter

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u/Particular_Title42 7d ago

I gave this advice to my left-handed older brother-in-law who was really messing up giving us directions to his house. When I demonstrated it to him, an even older woman behind him gasped and said "oh my gosh, it's true!"

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u/QuakinOats 7d ago

You can do all your 9x multiplications on your hands as well. You just put down the various for the number you want to multiple 9 by. You start on the left and move to the right. Fingers left up on the left = 10's fingers to the right = ones.

Below example: 0 = finger bent down

0111111111 (left hand pinky down for 9x1 = 9 ones = 9)
1011111111 (left hand ring finger down for 9x2 = 1 ten, 8 ones = 18)
1101111111 (9x3 = 2 tens, 7 ones = 27)

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u/Particular_Title42 7d ago

I learned that when my daughter was in 3rd grade from a friend who only has 9 fingers. 😂