ickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 2 years agoPaniki.postimg.ccexternal-linkmessage-square5linkfedilinkarrow-up10arrow-down10
arrow-up10arrow-down1external-linkPaniki.postimg.ccickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 2 years agomessage-square5linkfedilink
minus-squarelogicbomb@lemmy.worldlinkfedilinkarrow-up0·2 years agoAlso, any number whose digits sum to a multiple of 3 is divisible by 3. For 51, 5+1=6, and 6 is a multiple of 3, so 51 can be cleanly divided by 3.
minus-squarevortic@lemmy.worldlinkfedilinkarrow-up0·edit-22 years agoI’d forgotten this trick. It works for large numbers too. 122,300,223÷3 = 40,766, 741 1+2+2+3+2+2+3 = 15
Also, any number whose digits sum to a multiple of 3 is divisible by 3. For 51, 5+1=6, and 6 is a multiple of 3, so 51 can be cleanly divided by 3.
I’d forgotten this trick. It works for large numbers too.
122,300,223÷3 = 40,766, 741
1+2+2+3+2+2+3 = 15
threw up and died while reading this
I wish I could read 😞
Just squint and wing it.