Expanation
Eponymous (similar) and non-eponymous (dissimilar) fractions
Fractions are eponymous (similar) if they have the same denominator.
Fractions are non-eponymous (dissimilar) if they have different denominators.
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Two eponymous (similar) fractions: 2/5 en 3/5
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Two non-eponymous (dissimilar) fractions : 1/4 en 1/6
Make fractions eponymous (similar)
Sometimes it is useful to make fractions eponymous (e.g. if you want to add fractions). In this case always make sure that:
The denominators of the fractions become equal
The denominators of the fractions become equal
The value of the fractions does not change
You can do this by multiplying the numerator and denominator of both fractions by the same number.
Example 1: Making the fractions 1/4 and 1/6 eponymous (similar)
We convert the fractions to fractions with denominator 24
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1/4 = 6/24 (numerator and denominator times 6)
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1/6 = 4/24 (numerator and denominator times 4)
The fractions 6/24 and 4/24 are eponymous (similar).
We can also make the fractions 1/4 and 1/6 eponymous (similar) by multiplying by other numbers.
Example 2: Making the fractions 1/4 and 1/6 eponymous (similar) with other numbers
We now convert the fractions to fractions with denominator 12
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1/4 = 3/12 (numerator and denominator times 3)
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1/6 = 2/12 (numerator and denominator times 2)
3/12 and 2/12 are eponymous (similar) fractions.
The Product of the denominators
Look again at the denominators of the fractions in Example 1:
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Denominators of the unequal fractions: 4 and 6
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Described to fractions with denominator: 24
24 is exactly the product of 4 and 6
It is always possible to make fractions eponymous (similar) this way:
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Calculate the product of the denominators of the unequal fractions.
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Convert the fractions to fractions with this product in the denominator.
Least Common Multiple (LCM)
Now we make the fractions from example 2 eponymous (similar) in a different way. The following applies now:
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Denominators of the unequal fractions: 4 and 6
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Written to fractions with denominator: 12
12 is the smallest number that is a multiple of 4 and 6.
We call 12 the
Least Common Multiple (LCM) of 4 and 6.
You can also make fractions eponymous (similar) like this::
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Calculate the Least Common Multiple (LCM) from the of the denominators of the non-eponymous (dissimilar) fractions.
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Convert the fractions to fractions with this number in the denominator.
The calculator makes the fractions eponymous (similar) based on the Least Common Multiple (LCM).