Content pfp
Content
@
https://warpcast.com/~/channel/math
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Mantej Rajpal pfp
Mantej Rajpal
@mantej
If you needed to quickly add 1+2+3+4+5+6+7+8+9 in your head how would you do it? No calculators and no need to Google any math tricks or the best way to do it or anything like that. Just curious how others think!
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six pfp
six
@six
match 1 and 9, 2 and 8, 3 and 7, 4 and 6 to get 4x10 and then add 5 = 45
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welp šŸŽ©šŸŒø pfp
welp šŸŽ©šŸŒø
@we
n (n+1) / 2 not that hard to remember if you're aware of it
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LucJodet.eth 🟪 pfp
LucJodet.eth 🟪
@lucjodet
I think Gauss had it right. =(1+9) + (2+8) + (3+7) + (4+6) + 5 = 10 + 10 + 10 + 10 + 5 = 45
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Thomas pfp
Thomas
@aviationdoctor.eth
I’d count on my fingers, run out of fingers, and give up
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Mike | Abundance 🌟 pfp
Mike | Abundance 🌟
@abundance
add first + last (10), multiple by half of the count (4.5) = 45
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Matt šŸŽ©šŸ–šŸŽ­ pfp
Matt šŸŽ©šŸ–šŸŽ­
@gk3345
10 10 10 10 5 = 45
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Wolcheg pfp
Wolcheg
@wolcheg
Group everything to 10 and count full tens and leftover...
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