assuming there are 5 digits 1,2,3,4, and 5,?

Question

without repetition of digits

how many are odd?
how many three digit numbers are there?
how many are even?
how many are multiples of five?
how many are less than 400?

Answer 1

You have to have an additional digit, 0, ie zero.

50% of the numbers will be odd. 50% will be even.
Including zero, there are 6 single digit numbers, 30 two digit numbers and 180 three digit numbers (a total of 216 numbers with three digits or less)

Multiples of 5? Which 5, yours or decimal?
Less than 400? 6 single digit numbers + 30 two digit numbers + 108 three digit numbers total 138.