Similar fractions occurs when the denominator or the bottom numbers are the same. In this case, adding similar fractions requires you to add the numerators; the top numbers together, and to keep the denominator the same. An example would be to add 2/8 and 5/8 equals 7/8.
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To add similar fractions such as 3/8 and 4/8 you simply add the numerators (top numbers) and keep the denominators(the bottom numbers) the same. so 3/8 + 4/8=7/8
Similar fractions are fractions with the same denominator. In order to add or subtract fractions they need to be similar.
Similar fractions are fractions with the same denominator. 1/5, 2/5,/3/5
The usual rules of addition of fractions apply.
To make the numbers involved in the ratio smaller and therefore (possibly) easier to comprehend. It also keeps teachers, schools and examiners happy ;). At the same time, we spend a lot of effort looking for similar fractions. Finding percentages, for example, are instances when we are moving away from reducing fractions. For addition and subtraction of fractions we need to look for similar fractions which, again, is a move in the opposite direction.
Similar fractions have the same denominator, dissimilar ones don't.