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Plus and Minus (Equal Denominators)

When adding or subtracting fractions with equal denominators, add or subtract the numerators and keep the denominator as it is.

Rule

Addition of Fractions with Equal Denominators

a c + b c = a + b c ,c0

Rule

Subtraction of Fractions with Equal Denominators

a c b c = a b c ,c0

Example 1

Compute 1 4 + 2 4 and 4 6 3 6

Using the rule above, you get that

1 4 + 2 4 = 1 + 2 4 = 3 4.

The same goes for subtraction, only now you have to subtract:

4 6 3 6 = 4 3 6 = 1 6.

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