a. When we add two fractions with unlike denominators and convert them to fractions with the same denominator, must we use the least common denominator?

b. When the least common denominator is used in adding or subtracting fractions, is the result always a fraction in simplest form?

a. Choose the correct answer below.

OA. No, but the advantage is that it is easier to write in simplest terms if the least common denominator is used

OB. Yes, the advantage is the fraction is easy to simplify

OC. Yes, the advantage is that the resulting rational number will be in simplest terms if the least common denominator is used

OD. No, but the advantage is that the resulting rational number will be in simplest terms if the least common denominator is used

b. Choose the correct answer below

OA. No the resulting rational number could have a numerator and denominator with a common factor greater than 1

OB. Yes, the results of adding or subtracting any fractions is a fraction in simplest form

OC. Yes, the resulting rational number will always be in simplest form if the least common denominator is used

OD. No, the resulting rational number will never be in simplest form if the least common denominator is used