Mastering Multi-Digit Math: Check Work & Explain Reasoning

Sarah has 245 marbles, and she buys 378 more. How many marbles does she have now? Check your work by subtracting the original amount from the total.

• 500

• 700

• 600

• 623

A bookstore sold 1,245 books in January and 1,678 books in February. How many books did they sell in total? Explain how you found your answer.

• 1,800

• 2,923

• 3,000

• 2,500

Tom has 1,500 stickers. He gives 275 stickers to his friend. How many stickers does Tom have left? Show your work to verify your answer.

• 1500

• 1000

• 1300

• 1225

In a school, there are 2,350 students. If 1,125 students are in the cafeteria, how many students are not in the cafeteria? Explain your reasoning.

• 1,225

• 1,500

• 2,000

• 1,000

A farmer harvested 3,456 apples and sold 1,789 apples at the market. How many apples does he have left? Check your calculations to ensure accuracy.

• 1667

• 1800

• 1500

• 2000

Lisa read 1,234 pages of a book last month and 1,456 pages this month. How many pages did she read in total? Describe how you calculated the total.

• 2,690

• 1,800

• 3,000

• 2,500

A toy store had 2,000 toys. They sold 1,250 toys during a sale. How many toys are left in the store? Verify your answer by checking your subtraction.

• 500

• 1,000

• 1,250

• 750

During a charity event, 1,200 people donated money. If 450 people donated online, how many donated in person? Explain your method for finding the answer.

• 300

• 750

• 600

• 900

A library has 5,678 books. If 1,234 books are checked out, how many books remain in the library? Show your work to confirm your answer.

• 5678

• 1234

• 444

• 4444

In a park, there are 3,200 trees. If 1,500 trees are planted this year, how many trees will be in the park next year? Explain your reasoning for the final count.

• 5,000

• 3,200

• 4,000

• 4,700