174. Dividing by Three

by jfjudah

I didn’t find this out until I was 30, so I’m telling you now.

If you need to know if a big number can be divided by three, add the individual digits together. If the sum can be divided by three, so can the actual number.

Examples:

  • 397: 3+9+7=19. Nineteen cannot be divided by three evenly, so neither can 397.
  • 4192: 4+1+9+2=16. Sixteen cannot be divided by three evenly, so neither can 4192.
  • 642: 6+4+2=12. Twelve can be divided by three evenly, so 642 can as well.
  • 9225: 9+2+2+5=18. Eighteen can be divided by three evenly, so 9225 can as well.

Just a little something for your educational future.

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