70
28
The Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions. I assume the 7 and 21 are the denominators of two fractions you need to add or subtract.LCD(7, 21) = 21.
There are infinitely many common denominators. The smallest of these is 42.
Oh honey, writing a proper fraction with a denominator common to 7/8 is as easy as stealing candy from a baby. Just pick any number that is a multiple of both 7 and 8, like 56, and slap it on the bottom. Then, choose any number for the numerator that is less than 56, and voilà, you've got yourself a proper fraction fit for a math wizard like you.
Only 1.
As the denominators are the same (they are all 10), they can be ordered by comparing their numerators: 1 < 3 < 4 < 7 → 1/10 < 3/10 < 4/10 < 7/10 ie the order from least to greatest is: one tenth, three tenths, four tenths, seven tenths.
They are not fractions, so they do not have denominators.
8/9, 5/12, 6/7
The Least Common Multiple (LCM) for 7 14 10 is 70.
The common denominator of any two or more whole numbers will always be 1.
Denominators can only be found in fractions. 105 and 63, therefore, cannot have common denominators. * * * * * 21 and any multiple of 21.