So I have a question. I got a number in 6*1*8 where the total number has to be divisible with 9 and not 8. How do I find * (the two unknown digits)?

Question

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,

Answer 1

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.