Question: I would love to understand how to solve this problem: 85 paper stars are required to fill a glass jar. Luke has already made 33 stars, but he needs to fill 4 bottles. How many more stars must Luke make?
Can you explain?
Answer: 
Luke must make 85 x 4 = 340 stars in total.
He needs to make another 340 - 33 = 307 stars.