What is the least common divisor of 10 and 45?

Answer 1

The divisor of a number is a number which divides into that number.

The least divisor of any number 1, so the least common divisor of 10 and 45 is also 1.

Perhaps you meant "Least Common Multiple" (the smallest positive number which 10 and 45 divide without remainder) in which case LCM(10, 45) = 90

Or you meant "Highest Common Factor" (the largest positive number which divides into both 10 and 45 without remainder) in which case HCF(10, 45) = 5.

Answer 2

The least common factor of any set of positive integers is 1.