Yes.
yes you should use a common denominator when subtracting with fractions, it makes it much easier.
No only when adding or subtracting fractions a common denominator is needed
No, You only need a common denominator when adding or subtracting fractions.
You need a common denominator for both.
Because the answers will be wrong when adding or subtracting them if they don't have a common denominator.
Because if there's no common denominator it'll be hard to simplify. And will cause you to get a headache.
The first step to take is find the lowest common denominator of the fractions which can be done by finding the lowest common multiple of the numbers.
You don't need a common denominator to divide fractions.
To add and subtract fractions, you need common denominators. To find the common denominator, find the LCM of the denominators you wish to add or subtract.
You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.
Yes.
Finding a common denominator makes it possible to add two fractions because it allows us to write each fraction as a multiple of a common (usually smaller) fraction. Subtracting fractions works the same way; find a common denominator so that the fractions involved are in the same terms.