3-Digit Addition Strategies: Check Your Work!

1. Sarah has 245 marbles, and her friend gives her 378 more. How many marbles does Sarah have now?

• 400

• 500

• 300

• 623

2. A library has 512 books, and it receives a donation of 289 books. How many books are in the library after the donation?

• 801

• 600

• 512

• 700

3. Tom collected 134 stickers, and then he bought 256 more. How many stickers does Tom have in total?

• 256

• 512

• 390

• 134

4. A toy store sold 423 toys in January and 289 toys in February. How many toys did the store sell in total over the two months?

• 500

• 600

• 800

• 712

5. Lisa read 145 pages of a book, and then she read 367 more pages. How many pages did she read altogether?

• 512

• 600

• 450

• 400

6. A farmer has 215 apples and picks 487 more from his trees. How many apples does he have now?

• 800

• 702

• 500

• 600

7. In a school, there are 342 students in the morning session and 256 students in the afternoon session. How many students are there in total?

• 598

• 600 students

• 500 students

• 598 students

8. A baker made 678 cookies and sold 245 of them. How many cookies does the baker have left?

• 500

• 433

• 400

• 678

9. A zoo has 123 lions, 245 tigers, and 156 bears. How many big cats are there in total?

• 245

• 368

• 123

• 156

10. Emma has 456 stickers, and she gives 123 to her friend. How many stickers does Emma have now?

• 456

• 333

• 333

• 400