Mrs. Smith has 24 boxes of ornaments. Each box has 15 ornaments in it. She will use 185 ornaments on her tree this year how many ornaments will not be used?

She will not be using 175 ornaments.

Step-by-step explanation:

Since there are 24 boxes of ornaments that each contain 15 ornaments, you have to multiply these two numbers together. When doing this, you get 360. In the problem, it also gives you the information that she will be using 185 ornaments. Therefore, you have to subtract 185 from 360. When doing this, you get 175. She will not be using 175 ornaments.