If a number is a multiple of 8, it is a multiple of 4, so we can reduce the criteria to numbers that are both a multiple of 8 and a multiple of 5. A number that is a multiple of 8 must be an even number because 8 has no odd factors. A number that is a multiple of 5 must either end in a 5 or a 0. Since a number that ends in 5 is odd, the number we are looking for must end in a zero. Our candidates have now been reduced to the following list:
70, 80, 90, 100, 110
Only one of which is a multiple of 8. I'll leave it to you to figure out which one.
John
My calculator said it, I believe it, that settles it
