Hi there, Natalie,
It seems like you left out the ending to your math problem. Assuming there is one number left in the equation, the equation would be:
18 + 16x = Answer
When something is "more" than a number it means that it is adding to that number. For instance, if you have 4 more eggs than me, and I have 3 eggs, it means you must have 7 eggs. So that is why we add the 18 in this equation.
The product of a number and another number means that we are multiplying the two numbers together. In this case, it looks like the 16 is being multiplied by another number that you forgot to type in your question. Since that number is unknown, we would use the letter "x" as a placeholder.
We must also remember to follow the order of operations to make sure we get the right answer. In this instance, the multiplication should come before the addition.