24, 48, 72.
first three common factors of 3,4,5
24, 48, 72
The common factors are: 1, 2, 3, 4, 6, 12
9 and 21 only have two common factors: 1 and 3.
The only common factor is 1.
1, 2 and 5
Common factors of: - 30 = 1,3,5,10,15,30 45 = 1,3,5,15,45 105 = 1,3,5,7,15,21,35,105 So the common factors in all three numbers are 1,3,5 & 15.
There are only 2, and these are 1 and 2.
Eight factors.
The first three multiples of 9 are 9, 18 and 27. For them to be common, they need to be compared to another set of factors.
114, 228, 342
16 and 21 only have one common factor, the number one.