Best Answer

In math when you are given a negative and a positive number, you should write down the sign of the greatest number and subtract the smaller number from the greatest number. In the problem 3 - 9, three is the positive number, and nine is the negative number. This means you should write down the negative number's sign and subtract 3 from 9, and your answer should be -6.

User Avatar

Wiki User

6y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: What does negative plus positive equal to?
Write your answer...
Still have questions?
magnify glass