LCM
LCM 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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LCM and GCD: fast methods (prime factorization, ladder and Euclid)
Find the LCM and GCD by prime factorization, by the ladder method and with the Euclidean algorithm, use lcm · gcd = a · b and solve the classic word problems.
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