Pros and cons

If p is a positive integer and q is a negative integer, which of these expressions is the greatest?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative

Problem



If $p$ is a positive integer and $q$ is a negative integer, which of the following is the greatest?

$p-q$             $q-p$             $p+q$             $-p-q$