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I'm not sure what you are asking. Sums represent either an increase of one quantity by another quantity, or a combination of two quantities. Two of anything is a pair. Did you mean to ask, "What are sums of pairs?" One common use of a pair in mathematics is an ordered pair, such as (2,3). This can represent a coordinate in a graph, or it can represent a vector. If pairs represent a vector, you add the components, so (2,3) + (40,50) = (42, 53).
The old saying, if you have to ask....
There don't seem to be any well known ones. Perhaps you should ask your teacher.
One square foot is 144 square inches. If you want a specific conversion ask for which units.
Ask another question and include the date and type of error on the penny.