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The highest common factor of 21 and 18 is 3

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9y ago

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Is there any number that goes into 21 and 18 equally?

Yes, the numbers that divide both 21 and 18 equally are their common divisors. The greatest common divisor (GCD) of 21 and 18 is 3. Therefore, the numbers that go into both 21 and 18 equally include 1, 3, and any other factor of 3.


How many times can 18 go into 21?

The number of times 18 can go into 21 is 1. This is because 18 is the largest multiple of 18 that is less than or equal to 21. When 18 is divided into 21, it goes in once with a remainder of 3.


What number is halfway between 18 and 21?

The number halfway between 18 and 21 can be found by taking the average of the two numbers. To do this, add 18 and 21 together to get 39, then divide by 2 to get 19.5. Therefore, the number halfway between 18 and 21 is 19.5.


What number goes into 18 and 31?

The only number that goes into 18 and 31 is 1.


What number goes into 10 and 21?

Nothing.. Because 21 is a Prime number


What number goes into 12 and 21?

There is no number that goes into both. must be a trick questionthis is another person not the same one :)the number that goes into 12 and 21 is 3 which is a 5th grade problemwho ever said theres no number that goes into 12 and 21 is WRONG!


What number goes into 21 and 40?

The number is 1.


What goes into 34 that also goes into 21?

It is the number 1


Why is 21 a composite number?

21 is composite number because it has more than one number that goes into it


What even number gose in 21?

No even number gose in 21. In fact there is none that goes in 21, either.


What number goes into 11 and 18?

The number is 1.


What number goes into 18?

1,2,9