ickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 11 months agoPaniki.postimg.ccimagemessage-square149fedilinkarrow-up11.31Karrow-down152
arrow-up11.26Karrow-down1imagePaniki.postimg.ccickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 11 months agomessage-square149fedilink
minus-squareColalextrast@lemmynsfw.comlinkfedilinkEnglisharrow-up7·edit-211 months 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-up1·11 months 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