Todd says that he can make 10 if he adds 32 coins to 28 coins. Is he correct? Explain how you know using words.

He was wrong, you cannot make 10 coins by adding 32 coins to 28 coins. If you want to obtain 10 coins from 32 coins and 28 coins, you can subtract 28 coins from 32 coins.

This can be illustrated as follows:

32-28=10