The school library started with 623 DVDs. They received a donation of 178 DVDs, lent out 245 DVDs, and then purchased 89 new ones. How many DVDs are now in the library?

Ms. Wilson's class collected 789 aluminum cans for recycling. They collected 356 more the next week. If each can is worth 5 cents, how much money did they raise in total?

The school cafeteria had 1024 apples in stock. They used 378 on Monday, 295 on Tuesday, and received a delivery of 200 on Wednesday. How many apples do they have now?

At the beginning of the art project, there were 567 popsicle sticks. The teacher bought 234 more, but 45 were broken. If each student needs 8 sticks, how many students can complete the project?

The school's book fair started with 876 books. During the week, 389 books were sold, 123 new books were added, and 45 books were damaged. How many books are left at the end of the fair?

The PE department began with 543 tennis balls. They lent 98 to another school, purchased 156 new ones, and found that 37 were too flat to use. How many usable tennis balls do they have now?

The science lab had 732 petri dishes. During experiments, 287 were used and 19 were cracked. If each remaining petri dish needs to be sterilized for 20 seconds, how many minutes will it take to sterilize all the petri dishes?

The art room had 456 paintbrushes at the beginning of the semester. The teacher bought 123 new ones, 89 were worn out, and then found 34 old ones. If each student needs 3 paintbrushes for the next project, how many students can participate?

Mrs. Lee started the year with 987 math worksheets. She used 456 for a unit, then printed 234 more. If she needs 600 worksheets for the next unit, how many will she have left?