When A/B is divided by C/D, just flip C/D into D/C and multiply. Outcome should be AD/BC.
No. you must make the denominators the same
To multiply fractions all you do is multiply the numerators and the denominators separately eg: 4/7 x 6/11 = 24/77. The "commonality" of denominators has no relevance.
When dividing fractions, the denominators don't matter. Multiply the first fraction by the reciprocal of the second.
When you're dividing fractions ... or multiplying thrm ... they don't need to have the same denominator.
Yes. When multiplying and dividing fractions your denominators do not have to be the same. The denominators only haveto be the same if you are subtracting or adding them.
No. Common denominators are needed for addition and subtraction, not multiplication or division.
Well, honey, when you're dividing fractions, you don't need to worry about common denominators like you do when adding or subtracting them. All you gotta do is flip the second fraction (the one you're dividing by) and then multiply straight across. It's as simple as that, no need for all the fuss about common denominators.
You change fractions into decimals by dividing their denominators into their numerators as for example 3/4 = 0.75
It depends what you are doing with the fractions. If you are multiplying or dividing fraction, the denominators do not need to be the same and the calculation can be carried out immediately. If you are adding or subtracting fractions, the denominators must be the same; if you have different denominators, the fractions must first be changed into equivalent fractions with the same denominator. When the denominators are the same (or have been made the same as equivalent fractions from being different) the calculation can be carried out.
No. To multiple fractions multiple the numerators together and multiply the denominators together and simplify (by dividing both numerator and denominator of the result by common factors until the only common factor is 1). The denominators only need to be the same when adding or subtracting fractions.
Unless you are using a calculator that adds them for you, it is much harder to add fractions with uncommon denominators. Having the same denominator allows you to only have to add the numerators for your answer.
The SUM is 31over63. When adding two fractions with uncommon denominators you give them a common denominator by multiplying the denominators. Then multiply the numerators by which their denominator was multiplied. This keeps the problem balanced. You would then have -18over63 plus 49over63. -18 plus 49 equals 31, giving you 31over63. If you needed to divide negative 2 over 7 by 7 over 9, the answer would be -18/49 because you 'keep' the first fraction, 'change' the function to multiplication, and 'flip' the second fraction when dividing fractions.