Find the least common denominator. Multiply each fraction by whatever will make it the LCD.
Example: 1/30 and 1/42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210, the LCD
30 x 7 = 210
42 x 5 = 210
1/30 x 7/7 = 7/210
1/42 x 5/5 = 5/210
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Simplify your answer into lowest term.Do the operation.
similar fraction is the same denominator and dissimilar fraction is cannot the same denominators
The answer depends on WHAT you want to do with them.
Similar fractions have the same denominator, dissimilar ones don't.
Because they could be equivalent fractions as for example 3/4 is the same as 12/16