ickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 11 months agoPaniki.postimg.ccimagemessage-square17fedilinkarrow-up10arrow-down10
arrow-up10arrow-down1imagePaniki.postimg.ccickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 11 months agomessage-square17fedilink
minus-squareDagwood222@lemm.eelinkfedilinkarrow-up0·11 months agoAny number where the individual digits add up to a number divisible by ‘3’ is divisible by 3. 51 = 5+1 = 6, which is divisible by three. Try it, you’ll see it always works.
minus-squareZacryon@feddit.delinkfedilinkarrow-up0·11 months agoOne of the reasons why I love the number 3. There are other neat digit sum tricks, see for example for the numbers 1 to 30 here: https://en.m.wikipedia.org/wiki/Divisibility_rule
minus-squareDagwood222@lemm.eelinkfedilinkarrow-up0·11 months agoThey didn’t teach stuff like this in school, which is silly. This is the kind of thing that a kid would eat up. It’s like they wanted to make sure people hated math.
minus-squareZacryon@feddit.delinkfedilinkarrow-up0·11 months agoI guess I was one of the lucky few who learned this in elementary school. And later again.
Any number where the individual digits add up to a number divisible by ‘3’ is divisible by 3.
51 = 5+1 = 6, which is divisible by three.
Try it, you’ll see it always works.
One of the reasons why I love the number 3. There are other neat digit sum tricks, see for example for the numbers 1 to 30 here: https://en.m.wikipedia.org/wiki/Divisibility_rule
They didn’t teach stuff like this in school, which is silly. This is the kind of thing that a kid would eat up. It’s like they wanted to make sure people hated math.
I guess I was one of the lucky few who learned this in elementary school. And later again.