101
24
You need to Writ edown all the factors.. :)
Yes.
Factors can be listed as factor pairs. With square numbers, one of those pairs will be the same number twice. When written as a list, only one of them will be used, leaving an odd number of factors.
-- List all the factors of the first number.-- List all the factors of the second number.-- Find any factors that appear on both lists.-- The highest one of those is the HCF of the two original numbers.