Um, this is the tricky and logical question, so we know that the last digit need to be 0 or 5 because it need to divided by 5, so we have this
***5
***0, I would prefer to use this
Now, we just need to take 8×3=24,so now we know that the three digit need to have division 24.
Next step,
Make up any number for example,
120 which can be divided by 24, so now we have the complete number
1200
Let's check:
1200÷3=400
1200÷5=240
1200÷8=150. As a result, 1200 is a four digit number divisible by 3, 5, 8. Hope it help!
