themaninblack@lemmy.world to memes@lemmy.world · 10 个月前Math(s)lemmy.worldimagemessage-square36fedilinkarrow-up1519arrow-down129
arrow-up1490arrow-down1imageMath(s)lemmy.worldthemaninblack@lemmy.world to memes@lemmy.world · 10 个月前message-square36fedilink
minus-squareSeeker of Carcosa@feddit.uklinkfedilinkEnglisharrow-up9·10 个月前Divisibility by 3 rule is real. If the sum of the digits of a number is divisible by 3, then the number itself is also divisible by 3. Same goes with 9. There’s an 11 rule, but it’s a bit convoluted.
minus-squareemmanuel_car@fedia.iolinkfedilinkarrow-up2·10 个月前There’s also a rule 34, but it’s super advanced.
Divisibility by 3 rule is real. If the sum of the digits of a number is divisible by 3, then the number itself is also divisible by 3. Same goes with 9. There’s an 11 rule, but it’s a bit convoluted.
There’s also a rule 34, but it’s super advanced.