Q: Do you have to have a common denominator when your multiplying?

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You can always find a common denominator by multiplying the denominators together.

The common denominator for a set of numbers is identified by simply multiplying the numbers together. This will not be the least common denominator, but that is not what the question is about.

No.

no

No you do not.

No.

YES.

That's a common denominator.

Nope, just when adding or subtracting.

Note: numerator is the top part of the fraction, denominator is the bottom part. 1) Find a common denominator. It may be the least common denominator, but it need not be; just multiplying the denominators also gives you a common denominator, not necessarily the smallest one. 2) Convert each fraction so that it has this common denominator. This means multiplying numerator and denominator by the same number.

Because it is not how multiplication or division are defined.

Common denominators are found by multiplying one denominator with another. Since you only have one here, you need another.

You can find a common denominator of any set of denominators by multiplying them together. That result will not necessarily be the lowest common denominator. Example: 1/6 and 1/9 6 x 9 = 54 and 54 is a common denominator of 6 and 9, but the LCD is 18.

When cross multiplying, finding the product of the means and extremes, you are technically getting a common denominator that reduces out.

Multiplying fractions is quite different from adding them. You just multiply the numberators and the denominators separately. You can find the common denominator if you like, but in the end (after simplifying), you'll get the same result, and the additional work of finding the common denominator and converting the fractions turns out to be unnecessary. Try it out for some fractions!

no. you can multiply straight across in fraction multiplication

The way that you can find the least common denominator is by first multiplying the 2 bottom numbers and whatever the product is that is your common denominator. to find the smallest one, you have to keep dividing it till it is in counting order or there is an odd number.

You get the original fraction.

Find a common denominator, which can always be accomplished by multiplying the two denominators together. Then convert each original fraction to the new denominator by multiplying both numerator and denominator by a number that will make the denominator of each fraction the same, then add the converted numerators and express the sum as a new fraction with the sum of the converted numerators divided by the common denominator. For example, a/b + c/d = (da + bc)/bd.

The easiest way to find a common denominator of two numbers is to multiply them. Therefore, one of the common denominators for 6 and 7 would be 42 (7 x 6). This method will not necessarily produce the lowest common denominator, but it will determine one. For example, multiplying 4 and 6 will give you 24 as a common denominator. However, the lowest common denominator for 4 and 6 is 12.

only when adding and subtracting

No, it does not.

I assume you're talking about multiplying the numerator and denominator by the same number in the case that you're trying to give two fractions common denominators. If you're multiplying 1/4 and 3/8 you first have to make them have a common denominator. The lowest common denominator would be eighths so you would multiply both the numerator and denominator of 1/4 by 2, which gives you 2/8. Then you would proceed to multiply both fractions together, Numerator x Numerator and Denominator x Denominator. The end result of this would be 6/64 which can be reduced to 3/32.

To add fractions, you have to find their common denominator by multiplying the two denominators together and one of the numerators to the others. Then you add just the top numbers together.

No.

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