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I kinda know the answer from just guessing and trying to input different numbers but I probably should use something like divisibility rule of 3 or 9 or something but I struggle. Answer I got:

  • 60 138,
  • 62 118,
  • 63 108,
  • 63 198,
  • 64 188,
  • 65 178,
  • 67 158,
  • 68 148,
  • 69 138,
Matti P.
  • 6,012
BlackAra99
  • 1

1 Answers1

2

The sum of the digits must be divisible by 9 for the whole number to be divisible by 9.

The last 3 digits of the number must be divisible by 8 , for the whole number to be divisible by 8.

  • Sum must be divisible by $9$ not necessarily equal. The criteria of division by $8$ can be refined a little since last three digits are $100+c$ in this case $c+4$ should be divisible by $8$ (see https://math.stackexchange.com/a/2174862/399263). – zwim Apr 23 '21 at 08:43