The first step it to find a common multiple to the denominators. The least common denominator is preferable because it is small but it is not necessary to find the least one. Next, convert each fraction into an equivalent factor with the common multiple as its denominator. Add together all the numerators and place this over the common denominator. Finally, simplify the answer, if possible.
For example
1/4 + 1/5 + 1/6
Find a common multiple: 4*5*6 = 120 (which is also the LCM).
Find equivalent fractions: 1/4 = 30/120, 1/5 = 24/120 and 1/6 = 20/120
So 1/4 + 1/5 + 1/6 = (30 + 24 + 20)/120 = 74/120
Simplify to 37/60.
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To add, subtract, or compare fractions which have different denominators, you must1) Find a common denominator
2) Convert the fractions into equivalent fractions, with that common denominator.
3) Presumably you already know how to add fractions with the same denominator.
Dissimilar fractions are not equivalent as for example 1/2 is the same as 2/4 but 3/5 and 2/7 are dissimilar fractions
Dissimilar fractions have different denominators.
You can compare similar fractions by looking at their numerators. You can compare dissimilar fractions by converting them to similar fractions and looking at their numerators. You can convert a dissimilar fraction to a similar fraction by finding the least common denominator.
addition subtraction multiplication division
The meaning of dissimilar fractions is when there is a pair or more of fractions that don't have the same denominator.