Question

If one addend of x is c, what is the other addend?

Answer 1

Answer:

Suppose I said "one addend of 43 is 20. What is the other addend?" What would you do to answer that question? Would you get an answer of 23? Good. What did you do with the sum and the one addend to get 23? Do the same thing with x and c. Of course you can't combine x and c and get a nice single number like you could with 43 and 20, so you have to indicate that process. If I were to indicate the process with 43, rather than actually doing the subtraction to get 23, I would indicate it by writing 43-20. Now, you do the same thing with x and c. Make sure you get them in the correct order, remembering that something lite 5-2 is not the same as 2-5.