ickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 2 years agoPaniki.postimg.ccimagemessage-square147linkfedilinkarrow-up11.31Karrow-down151
arrow-up11.25Karrow-down1imagePaniki.postimg.ccickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 2 years agomessage-square147linkfedilink
minus-squareMatch!!@pawb.sociallinkfedilinkEnglisharrow-up13·2 years agoQuick check for divisibility: subtract 7 from it. If the new number is divisible by 7, then the original number is too
Quick check for divisibility: subtract 7 from it. If the new number is divisible by 7, then the original number is too