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Mantej Rajpal ↑ pfp
Mantej Rajpal ↑
@mantej.eth
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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LucJodet.eth 🎩🟪 🔜 EthCC pfp
LucJodet.eth 🎩🟪 🔜 EthCC
@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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welp 🎩🌸 pfp
welp 🎩🌸
@we
n (n+1) / 2 not that hard to remember if you're aware of it
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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 🎩🍖🤫🎭 pfp
Matt 🎩🍖🤫🎭
@gk3345
10 10 10 10 5 = 45
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humanoid0x pfp
humanoid0x
@humanoid0x
Just started folding as soon as I read it :D
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DIMAS NUR ALAM pfp
DIMAS NUR ALAM
@lewyinase
+100 🔥 FIRE now yours. Don't forget to check your balance.
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Cartesse🎩 pfp
Cartesse🎩
@cartesse.eth
go for all 10 then easy calculs likee 9+1 + 2 + 8 + 3+7 +... then you figure it's 50 without calculating and just be confident haha
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MewMew 🔫🔵🎩🌈 ☪️ pfp
MewMew 🔫🔵🎩🌈 ☪️
@mooncats
What mental strategies do you use to quickly add numbers like 1+2+3+4+5+6+7+8+9 in your head, especially when you need to calculate them on the spot without external aids?
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IdeosecuAsisemba pfp
IdeosecuAsisemba
@ideosecuasisemba
1+9 is 10, 2+8 is 10, 3+7 is 10, 4+6 is 10, then add 5, so 10+10+10+10+5 is 45.
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PotlustSagenter pfp
PotlustSagenter
@potlustsagenter
Simple mental addition, starting with the bigger numbers: 9+8=17, 7+6=13, 5+4=9. 17+13+9=39, then adding the smaller numbers: 3+2=5, 5+39=44.
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