China Naming Network - Auspicious day query - How many common factors do thirty and sixty have?
How many common factors do thirty and sixty have?
30 and 60 have seven common factors: 2,3,5,6, 10,15,30.
30=2x 15，60=2x30
30=3x 10，60=3x20
30=5x6，60=5x 12
30=6x5，60=6x 10
30= 10x3，60= 10x6
30= 15x2，60= 15x4
30=30x 1，60=30x2