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Q: Can somone explain cross multiplication with a missing denominator or numerator?

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You can find a missing denominator if you know something that the fraction is equal to. Then you can find the missing denominator through cross multiplication.

The answer depends on what other information you have.

The answer depends on what other information you have.

An equivalent fraction is just a multiple of the one that you have (i.e it is the one that you have, scaled up or down). So multiply the fraction that you have until either the numerator or the denominator match the given numerator/denominator of the fraction with the missing number. The number in the corresponding place on the fraction that you multiplied is the missing number.

If you have 2 fractions then you do cross multiplication where you take the left numerator and times it by the right denominator if your looking for the numerator. If your looking for the denominator then you do the same thing only you use the top as your divider not the bottom. Well if it is an equation with another fraction equaling it, you can multiply the denominator by a number that will allow it to have the same value of the denominator in the other fraction. Once you know that number ( the one it took so the denominators were equal when multiplied) you just divide the fraction ( the one you have both denominator and numerator) by that number, and put it over the original lone denominator, then you have your answer. If you only have the numerator you use pretty much the same concept except opposite the steps. Here's an example: 7/? = 21/30 You would know 7 multiplies with 3 to get 21, so you divide 30 by 3 (the number it took to get 7 to be 21), and you get 10. Then you put the 10 underneath the original 7/? resulting in the answer being 7/10. So 7/10=21/30. Hope this is the answer you were looking for.

If you have a missing numerator (top number), divide the new denominator (bottom number) by the original denominator and multiply this by the numerator.If you have a missing denominator, divide the new numerator by the original numerator and multiply this by the denominator.examples:1/2 = ?/6Dividing denominators: 6 ÷ 2 = 3 Multiplying the numerator: 1 x 3 = 3⇒ 1/2 = 3/61/4 = 3/?Dividing numerators: 3 ÷ 1 = 3 Multiplying the denominator: 4 x 3 = 12⇒ 1/4 = 3/126/8 = ?/4Dividing denominators: 4 ÷ 8 = 1/2 Multiplying the numerator: 6 x 1/2 = 3⇒ 6/8 = 3/43/6 = 2/?Dividing numerators: 2 ÷ 3 = 2/3 Multiplying the denominator: 6 x 2/3 = 4⇒ 3/6 = 2/4

The answer depends on the numbers that ARE available.

Restate question: In working with equivalent fractions, how do you find a missing numerator?(If this is not your question, please resubmit your question with more information.)Example: Find an equivalent fraction for 2/5, with a denominator of 30.Solution: 2/5 = x/30. Since 30 = 5x6, you need to multiply the numerator by 6. 2x6=12.2/5 = 12/30.

Divide the product by the factor[s] you know. The answer is the missing factor.

The answer depends on the part of the question that is missing.

6/8=6/8

That really depends on what information is given.

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