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Q: How many two digit counting numbers are either multiples of 2 or multiples of 3?

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There are 6,750 such numbers.

The 3-digit counting numbers are 100 through 999 = 900 numbers.Half them are multiples of 2 (even numbers).The other half are not . . . 450 of them.

45 multiples of 2 plus 30 multiples of 3 minus 15 multiples of 6 equals 60 numbers

81 of them.

There are 720 of them.

8100

There are 450 of them.

81

500

4500 of them.

There are 9*10*9 = 810 such numbers.

5 ans 3

There are 898 three-digit even numbers. Nine of them are multiples of 55. That leaves 889 * * * * * There are 450 three-digit even numbers and 17 of them are multiples of 55. So that leaves 433.

There are 720 of them. The three digit counting numbers are 100-999. All multiples of 5 have their last digit as 0 or 5. There are 9 possible numbers {1-9} for the first digit, There are 10 possible numbers {0-9} for each of the first digits, There are 8 possible numbers {1-4, 6-9} for each of the first two digits, Making 9 x 10 x 8 = 720 possible 3 digit counting numbers not multiples of 5.

There are 30 two-digit multiples of 3 plus 18 two-digit multiples of 5 minus 6 two-digit multiples of both. Answer: 42

I believe there are 81. There are 9 after every multiple of 10, including 90.

All of the odd numbers between 11 and 99 inclusive are two digit numbers that are not multiples of 2. There are 45 of them.

There are 2000 4-digit numbers that are multiples of 5, so, instead of listing them all, it is equally valid to say: Any4-digit number whose final digit is either a 5 or a 0 is a multiple of 5. Get Right? :P

10,11,12,13,...,99

There are 450 such numbers.

There are 7200 such numbers.

999

99

That is 12745 of them

450

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