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What four-digit number is a common multiple of 12 40 and 45?
Any multiple of 360 between 1080 and 9720 inclusive.
What are the common multiples of four and seven?
28, 56, 84 you can always find a common multiple of two numbers by multiplying them (but that won't always be the least common multiple)... the other common multiples can b found by multiplying that number with any other positive integer... for example, if you have two numbers (a and b), then one of their common multiples is a x b (but not always the smallest one), and the others are 2 x a x b, or any other positive integer times a x b
What is a four digit number divisible by 3 and 5 but not 4?
If it's to be divisible by 5, it must end in 5 or 0. And if it's to be divisible by 3, adding the digits together must result in a multiple of 3.While some numbers that end in zero will still work, you can guarantee that the number won't be divisible by four by choosing a number that ends in five.So you'd need a four-digit number, that ends in 5, whose digits add up to a multiple of 3. The smallest such number would be 1005, and the largest would be 9975.(However, the actual largest number that would fit your question is 9990; remember that I did say some numbers that end in zero would still work.)
what are the four two digit multiples of 3?
There are more than four, starting with 12, 15, 18 and 21.
How many factors go into 21?
Every number is divisible by 21. Any element of the set of numbers of the form 21*k where k is an integer is evenly divisible.
