1,2,4
4
The only common factor of 4 and 5 is 1. 4 and 5 are common factors of 20 and 40.
20, among others.
The greatest common factor (GCF) is 2.
20 and 40.
140
20
Factors of 20:1,2,4,5,10,20Factors of 65:1,5,13,65The common factors are 1 and 5.
12
Common factors of 20 are; 1,2,4,5, and 20. 1x20=20, 2x10=20, 4x5=20, 5x4=20, 20x1+=20. If you have to show your work then just check mine.The factors of 20 are 1,2,4,5,10 and 20. For them to be common, they have to be compared to another set of factors.
The common factors of 18 and 20 are 1 and 2.
Common factors for 20 & 25 are: 1 & 5