I'm just checking myself but here:
Lily completed a math project worth 200 points. She earned all but 13 points. How many points did she earn?
Isn't it 200-13??
Yes, you subtract. What answer do you get?
Yes, you're correct! To find out how many points Lily earned, you can subtract the points she didn't earn (13) from the total points of the math project (200). So the calculation would be:
200 - 13 = 187
Therefore, Lily earned 187 points on her math project.