Answer
Numerical / word / etc. result from calculations only.
Solution
Description of how you solved the problem, more than a description of your calculations, explains your
reasoning in the context of the problem. Can someone reading this understand what you did without
knowing about the problem?
Problem
A solution path is not immediately known.
Exercise
Solution path is known.
Numbers
Ideas or concepts. Six, for instance, is the idea of "six-ness".
Number words
The names for numbers. We can distinguish between names that are spoken or heard and names that
are written or read.