Q: How many four-digit numbers are multiples of 15?

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Numbers which are the factors of thirty and multiples of five are 5, 10, 15 and 30.

There are infinite common multiples for a set of numbers. So it is not possible to write down all the common multiples. Some common multiples of 15, 30 and 45 are 90, 180, 270, 360,... There is another way to find common multiples: Write the multiples of LCM(15, 30, 45). Actually the common multiples of a set of numbers are the multiples of their LCM. LCM of 15, 30 and 45 is 90. And the multiples of 90 are 90, 180, 270, 360, 450, 540,... which are the common multiples of 15, 30 and 45.

Every multiple of 60 is a multiple of both 12 and 15.

Do you mean common multiples? If so, then 30, 60, 90 etc. are common multiples of 30 and 5. If you mean multiples of 5 and factors of 30, that's 5, 15 and 30.

We can't answer that without knowing the numbers. The first five multiples of 5 are 5, 10, 15, 20 and 25.

Related questions

An infinite amount.

20 of them.

An infinite number of them.

There are three numbers between 10 and 50 which are divisible by both 3 and 5. All numbers that are multiples of 3 and 5 are the multiples of the lowest common multiples (lcm) of 3 and 5 which is 15. The multiples of 15 between 10 and 50 are {15, 30 and 45}, thus there are 3 numbers.

Three numbers.

No, they are factors of 15. Factors go into numbers, numbers go into multiples.

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

Many other numbers share some multiples with 15. However, only two numbers share all of 15's multiples: 3 and 5.

Multiples of 810

Numbers which are the factors of thirty and multiples of five are 5, 10, 15 and 30.

Since both 3 and 5 are prime numbers, only numbers that are multiples of its product are the numbers that are divisible by both. 15 is the LCM of 3 and 5 and hence all multiples of 15 are divisible by both 3 and 5

The numbers that are between 55 and 101 that are also multiples of 3, 10 and 15 are: 60, 75 and 90.