What is the greates common factor of 78 and 780?

Answer 1

The greatest common factor (GCF) of 78 and 780 is 78. Since 78 is a factor of 780, it is automatically the GCF.

Answer 2

• Factors of 78: 1, 2, 3, 6, 13, 26, 39, 78
• Factors of 20: 1, 2, 4, 5, 10, 20
• GCF (78, 20) = 2

Answer 3

Since 78 is a factor of 780, it is automatically the GCF.