This is the fourth part of the Metrobank-MTAP Math Challenge Questions for Grade 7. In this post, we discuss the solutions to number 21-30. You can also read the solutions to **1-10,** **11-20, **and **21 – 30**.

**31.)** If is a prime number not equal to 2, which of the following can be a prime:

, , .

**Solution**

All prime numbers not equal to 2 are odd. If is odd, then and are both even, while is odd. Therefore, only can be a prime.

**Answer:**

**32.)** What must be added to the product of and to obtain ? Continue reading “Grade 7 MTAP 2015 Questions with Solutions Part 4”