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OpenStudy (anonymous):
did you guys know that 21^2 -21 = 420. Just found out. lol
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OpenStudy (alexandervonhumboldt2):
i know this.
OpenStudy (♪chibiterasu):
Why is it such a big deal.
OpenStudy (alexandervonhumboldt2):
11^2-11=110 what is interesting in it?
OpenStudy (alexandervonhumboldt2):
10^2-10=90
hartnn (hartnn):
21 (21 -1) = 21* 20 = 420 thats how i did it in my head
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OpenStudy (anonymous):
420 joke obviously
TheSmartOne (thesmartone):
@hartnn teach me more tricks and tips ;p
OpenStudy (anonymous):
lol.
OpenStudy (chantysquirrel1129**):
hahaha wow cx ._.
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