What is the greatest common factor of 55 and 144?

Answer 1

There is only one highest common factor which is: hcf(55, 145) = 5

The factors of 55 are: {1, 5, 11, 55}

The factors of 145 are: {1, 5, 29, 145}

The common factors are: {1, 5}

The highest common factor is 5.

Answer 2

• Factors of 55: 1, 5, 11, 55
• Factors of 144: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
• GCF (55, 144) = 1