arithmetic
arithmetic articles on the Math Mental blog, with worked examples solved step by step.
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Fractions: how to add, subtract, multiply and divide, with examples
To add or subtract fractions, rewrite them over the same denominator (ideally the least common multiple) and combine the numerators. To multiply, multiply numerators together and denominators together. To divide, multiply the first fraction by the reciprocal of the second. Simplify at the end or, better, before multiplying.
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