You need at least two denominators to find something in common between them.
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
2/5 = 0.4
The least common denominator is the least common multiple of the denominators.
That's a common denominator.
multiply the denominators
As a decimal 2/5 = 0.4
It is: 2/5 of 40 = 16
The least common multiple of the denominators is knows as the LCD or least common denominator.
If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators.