factorize(42) = 2 x 3 x 7
Use a factor tree. 42 21,2 7,3,2
List the integers that will divide into 42 evenly with no remainder.
1, 2, 3, 6, 7, 14, 21, and 42 are the factors of 42. You need another set of factors to compare them to to find something in common.
All Factors of 42:1, 2, 3, 6, 7, 14, 21, 42
the factors of 42 are 1,42,6,7,2,21,3,14
42 Divide by two. 21,2 Divide by three. 7,3,2 Stop.
All Factors of 42:1, 2, 3, 6, 7, 14, 21, 42
We won't be able to find factors of 80 that are not factors of 80. The factors of 80 that aren't factors of 42 are 4, 5, 8, 10, 16, 20, 40 and 80.
7 and 6
1,42,2,21,3,14,6,7 are the factors of 42.