Question

select all keywords that mean addition. (hint: there are 3)
total
difference
how much is left?
sum
combined
fewer

Explanation:

"Total" refers to the result of adding numbers together. "Sum" is the outcome of addition. "Combined" implies putting things together through addition. "Difference" and "How much is left?" relate to subtraction, and "Fewer" is associated with comparison and subtraction - like finding the difference in quantity.

Answer:

Total, Sum, Combined