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He even nailed some pretty dense math problems like, “Find the least common multiple of six, eight, and sixteen.”

Last night I had a dream in which I proved the non-existence of God by the least common multiple.

In adding and subtracting fractions the pupil should not find the least common multiple of their denominators but should find any common multiple that he can find quickly and correctly.

He posted the first video on Nov. 16, 2006; in it, he explained the basics of least common multiples.

There should be no such thing as instruction, in the sense which implies the cramming of the brain with information, or such mental gymnastics as conjugating irregular verbs and hunting for the least common multiple.