Show:
Fluently Add and Subtract Within 1,000 (NBT.2)
Multiply a One-Digit Whole Number by Multiples of 10 (3.NBT.3)
Estimating Sums and Differences Within 1,000 (3.NBT.2)
Estimating Products of One-Digit Numbers and Multiples of 10 (3.NBT.3)
Error Analysis of NBT Problems
100

A pet store had 648 bags of dog food. They sold 279 bags in a week. How many bags are left?

 Answer: 369

100

A farmer has 6 fields. Each field has 50 trees. How many trees does the farmer have?

 Answer: 300

100

Estimate: 479 + 326 ≈ ?

Answer: 800

100

Estimate: 7 × 40

Answer: 300

100

A student solved 563 + 248 = 711. Find the mistake and give the correct answer.

Answer: 811

200

Maria’s school library had 532 books. They received 187 new books. How many books are there now?

 Answer: 719

200

A warehouse has 7 shelves. Each shelf holds 80 boxes. How many boxes are there in total?

 Answer: 560

200

A factory made 849 toys. About 267 were sold. Estimate how many toys are left.

 Answer: 600

200

A business buys 9 stacks of paper, each with 40 sheets. Estimate the total sheets.

Answer: 400

200

A student found 723 - 356 = 477. What is the correct answer?

Answer: 367

300

Jason collected 426 baseball cards. He gave away 135 to his friends. How many cards does he have left?

Answer: 291

300

A teacher has 5 stacks of notebooks. Each stack has 40 notebooks. How many notebooks does she have?

Answer: 200

300

There were 658 students in a school. 245 went home early. Estimate how many students remain.

Answer: 400

300

A farmer has 6 fields, each with 90 cows. Estimate the total cows.

 Answer: 600

300

A student calculated 9 × 70 = 4900. What is the mistake?

 Answer: 630


400

A farmer picked 573 apples. He sold 246 apples at the market. How many apples remain?

 Answer: 327

400

A truck carries 9 crates, each containing 70 oranges. How many oranges are there?

Answer: 630

400

A store sold 765 sandwiches on Monday and 384 on Tuesday. Estimate the total number of sandwiches sold.

Answer: 1,200

400

A school orders 8 sets of computers, each with 90 computers. Estimate the total.

Answer: 700

400

A student solved 745 + 382 = 1027. Find the correct answer.

Answer: 1,127

500

There are 815 students in a school. If 289 students go on a field trip, how many students remain?

Answer: 526

500

A gardener plants 4 rows of flowers. Each row has 30 plants. How many flowers are there?

Answer: 120

500

A truck carried 928 pounds of food. It delivered 463 pounds. Estimate how much is left.

Answer: 500

500

A factory produces 6 boxes of shoes. Each has 60 shoes. Estimate the total.

Answer: 400

500

A student found 632 - 489 = 233. What is the correct answer?

Answer: 143