Section: Math Section 1

14) What is the greatest prime factor of 77?

1. 7
2. 11
3. 27
4. 43
5. 77

The factors of 77 are 1, 7, 11, and 77; 77 is a factor of 77, but it is not prime. 11 and 7 are both factors of 87 and prime, so the greater of these, (11), is correct.