How many integers between 1-100 are divisible by 3?

You can state the qurstion in an other way

how many integers between 1-100 has 3 in their prime compostion or how many many numbers can be written as 3*a where a is any number

the multiplication table of 3 shows that 3*33=99

which means that highest product below 100 is 3*33

so there are 33 numbers that are divisible by three

They are 17 odd numbers.