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There is no such thing as a 'highest common multiple', but the least common multiple or LCM can be found using prime numbers. The LCM of the given numbers is the product of all different prime factors to their greatest power. If there are no exponents, the greatest power of the prime factors is 1 and each different prime factor is used in the multiplication:

prime factors of 210 are 2 x 3 x 5 x 7;

prime factors of 147 are 3 x 72;

the LCM of 210 and 147 is 2 x 3 x 5 x 72 = 1470

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Q: What is the highest common multiple of 210 and 147 using prime numbers?
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