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To subtract fractions, the denominators (bottom numbers) must be equal; so first convert the fractions into equivalent fractions with the same denominator.
Then the numerators (top numbers) are subtracted and the resulting fraction simplified:

1/4 - 1/8 = 1x2/4x2 - 1/8
= 2/8 - 1/8
= 2-1/8
= 1/8
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11y ago

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