ickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 1 year agoPaniki.postimg.ccimagemessage-square126fedilinkarrow-up11.24Karrow-down148
arrow-up11.19Karrow-down1imagePaniki.postimg.ccickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 1 year agomessage-square126fedilink
minus-squareColalextrast@lemmynsfw.comlinkfedilinkEnglisharrow-up6·edit-21 year agoIt goes like this create 2 distinct numbers by isolating the last digit from the other. For example, 154 becomes 15 and 4. double the number derived from the last digit. So, the four becomes 8. subtract from the number derived from the preceeding digits. 15 - 8. the resulting number is 7. Seven is divisible by 7, so we know 154 is divisible by 7.
minus-squareAccountMaker@slrpnk.netlinkfedilinkarrow-up1·1 year agoOooh, I didn’t realize that you subtract from the original number without the last digit. Thanks
It goes like this
create 2 distinct numbers by isolating the last digit from the other. For example, 154 becomes 15 and 4.
double the number derived from the last digit. So, the four becomes 8.
subtract from the number derived from the preceeding digits. 15 - 8.
the resulting number is 7. Seven is divisible by 7, so we know 154 is divisible by 7.
Oooh, I didn’t realize that you subtract from the original number without the last digit. Thanks