You need at least two denominators to find something in common between them.
A single fraction cannot have a common denominator since there is nothing for it to be in common with!
To add fractions one must have common denominators. 10 looks good here 3/10 + 2*4/2*5 3/10 + 8/10 = 11/10 ---------------
You use them when there are 2 fractions with different denominators.
Common multiples and common denominators can be found using the same process. They differ in their function. Common denominators are common multiples that are functioning as denominators.
24
Common denominators are common multiples of two or more denominators.
2/5 = 0.4
Denominators which have no common factors
The least common denominator is the least common multiple of the denominators.
That's a common denominator.
multiply the denominators
It is: 2/5 of 40 = 16
As a decimal 2/5 = 0.4