Question

How many two digit numbers are divisible by either 3 or 5?

Answer 1

u mean factors??

Answer 2

Starting at 12 and ending at 99, there are 30 two-digit numbers divisible by three.

Answer 3

and with both 3 & 5 its ... 6 (15,30,45,60,75,90)

Answer 4

So let's think about this. How often do number divisible by 3 occur? Every 3 number right? How many 2 digit number are there? Well let's look at all the numbers counting to 100. We lose 100 and 1 through 9 as possibilities. So there are 90 two digit numbers.

How many of those 90 are divisible by 3? Well since they occur every 3, then divide the total number by 3.

90/3=30

So 30 numbers are divisible by 3. This should make sense.

How many numbers are divisible by 5? Take a guess, and I'll help you out since we're not done yet once you do that since we can't just add up both of these numbers since some numbers are divisible by both 3 and 5 and we're counting these numbers twice.

Answer 5

No I meant the amount of numbers that there are going to be divisible by 3 and 5

Answer 6

@legendarymath that's what I'm talking about too. Read my response, if any of it doesn't make sense I'll answer all your questions.

Answer 7

3 OR 5 hardly the same as 3 AND 5

Answer 8

yup @Kainui is right good job!