Here are 10 mixed addition and subtraction word problems for 3rd grade:

---

1. Lily has 47 apples. She picks 28 more apples from the tree. How many apples does she have now?

2. Tom had 85 marbles. He gave 29 of them to his friend. How many marbles does Tom have left?

3. There are 72 books on the shelf. Sarah bought 18 more books. How many books are on the shelf now?

4. There are 56 students in the school library. 17 students left to go home. How many students are still in the library?

5. Jake had 135 toy cars. He sold 42 of them. How many toy cars does Jake have now?

6. Emma has 64 pencils. She gave 22 pencils to her classmate. How many pencils does Emma have left?

7. A bakery made 150 cupcakes. They sold 95 of them. How many cupcakes are left in the bakery?

8. In the playground, there are 58 children playing. 27 children went home. How many children are still playing?

9. Sam has 120 stickers. He gets 39 more stickers as a gift. How many stickers does Sam have now?

10. There are 180 pages in a book. Alex has already read 74 pages. How many pages does Alex still need to read?

---

Would you like more examples or any further explanations on how to solve them?

Here are 5 related questions to expand on this:

1. How would you solve a problem where you're asked to find the total after adding and subtracting multiple numbers?
2. What strategies can help you check if your addition or subtraction answer is correct?
3. How do you solve word problems that involve both addition and subtraction in the same question?
4. What would you do if a word problem involved large numbers (over 100)?
5. How can drawing pictures or using objects help you understand word problems better?

Tip: Always underline or highlight key numbers and operations (addition or subtraction) in word problems to make sure you're solving the right part.