If the denominator of a fraction contains a prime factor other than 2 and 5, the fraction cannot be reduced to a finite fraction

If the denominator of a fraction contains a prime factor other than 2 and 5, the fraction cannot be reduced to a finite fraction

No, it depends on whether it is the simplest fraction. If it is, it can't be reduced to a finite fraction. If it isn't, it depends on whether the denominator after reduction contains any prime factors other than 2 and 5. If it is, it can't be reduced to a finite fraction. If not, it can be reduced to a finite fraction

The least common multiple of two numbers must be the product of the prime factor of () and the prime factor of ()
Not for speed, but for quality

The least common multiple of two numbers must be the product of the prime factors of the two numbers (same) and (different)