Q: Which even two-digit number is a common multiple of 5 and 7?

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the answer is 70!!

The number is 18, It is even number, it is factor of 198 and multiple of 9

Any number that is divisible by 2 and is a multiple of that particular number is called an even multiple. Ex: The even multiples of 7 are: 14, 28 etc

Because your beginning number was a multiple of 2.

No. Since 4 is an even number, then any multiple of 4 will also be an even number. An even number will have an even digit in its ones place (0,2,4,6, or 8).

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No. A multiple of an even number cannot be odd.

There is no greatest common multiple as whatever number is claimed to be the greatest, the lowest common multiple of them (216) can be added to get an even greater common multiple.

20 and 50 10 and 25

An even number can be a multiple of an odd number OR an even number. An odd number cannot be a multiple of an even number.

The LCM of 2 and any even number is that number.

The Least Common Multiple (LCM) for 3 5 7 8 is 840.

the answer is 70!!

No. The LCM of 2 and any other even number is the other number.

There is no greatest common multiple of two (or more) numbers: whatever number you come up with as the greatest common multiple I can always add their lowest common multiple to get an even higher common multiple. If you meant the LOWEST common multiple (the least number that both divide into with a remainder) then lcm(72, 180) = 360. If you meant the greatest common FACTOR (the greatest number that divides into both), then gcf(72, 180) = 36.

Short answer: There is not one. You could say that the greatest common multiple is infinity since there are an infinite number of common multiples. If you give a specific number as the greatest common multiple, you can always find a larger one by doubling it. For example, 9856 is a common multiple of 88 and 112. But, it is not the greatest common multiple. I can double it to make a larger common multiple: 19,712. I could multiply this one by 100 to make an even larger common multiple: 1,971,200. I can always make a larger common multiple.

If the 2 digit number is a multiple of both 5 and 7 then it is a multiple of (5 x 7) which equals 35. The only even 2 digit number which is a multiple of 35 is, 2 x 35 = 70

I suppose the greatest common multiple could be considered as infinity. Once you calculate the least common multiple, you could keep doubling it forever. You could never determine a greatest common multiple, because every time you decided on a number, you could double it or multiply it by another positive integer, and have an even larger common multiple. There are an infinite number of common multiples.