3.NBT.2 Part 1

Jase found the sum of 321 + 256 by using expanded form to add. Which expression did he use?

• 300 + 200 + 20 + 50 + 1 + 6

• 300 + 200 + 100 + 200 + 500 + 600

• 3 + 2 + 1 + 2 + 5 + 6

• 300 + 70 + 6

Answer explanation

Jase used expanded form to add 321 and 256, breaking them down into hundreds, tens, and units: 300 (from 321) + 200 (from 256) + 20 (from 321) + 50 (from 256) + 1 (from 321) + 6 (from 256), which sums to 577.

2. There are 800 seats at a concert. There are 583 people sitting in the seats. How many seats are empty?

• 200

• 217

• 307

• 317

Answer explanation

To find the number of empty seats, subtract the number of people from the total seats: 800 - 583 = 217. Therefore, the correct answer is 217.

6. Study the equation:  673 + 248 = 921. Which equation could be used to find the check to see if the equation is correct?

• 921 - 238 = 673

• 921 - 248 = 673

• 921 + 248 = 673

• 921 + 248 = 663

Answer explanation

To check if 673 + 248 = 921 is correct, we can rearrange it as 921 - 248 = 673. This confirms the original equation by verifying that subtracting 248 from 921 gives us 673, making the correct choice 921 - 248 = 673.

There were 216 men, 236 women, and 85 children at a concert. How many people were at the concert?

• 437

• 452

• 527

• 537

Answer explanation

To find the total number of people at the concert, add the number of men, women, and children: 216 + 236 + 85 = 537. Therefore, the correct answer is 537.

Ella has 358 dolls. She sells 143 of them. How many dolls does Ella have left?

• 115

• 215

• 295

• 501

Answer explanation

To find out how many dolls Ella has left, subtract the number of dolls she sold from the total she had: 358 - 143 = 215. Therefore, Ella has 215 dolls left.

Students at Sunnyside Elementary collected cans for their recycling project.

3rd grade: 215 cans

4th grade: 103 cans

5th grade: 214 cans

How many total cans were collected?

• 318

• 522

• 532

• 632

Answer explanation

To find the total cans collected, add the amounts from each grade: 215 (3rd) + 103 (4th) + 214 (5th) = 532. Therefore, the correct answer is 532.

900 - 749=

• 185

• 287

• 285

• 151

Answer explanation

To solve 900 - 749, subtract 749 from 900. The calculation gives 151, which is the correct answer. Therefore, the answer is 151.

345 + 129 =

• 464

• 458

• 563

• 474

Answer explanation

To solve 345 + 129, add the numbers directly: 345 + 129 = 474. Therefore, the correct answer is 474.

Boston used this model to add 153 + 172. How many hundreds are there in all?

• 3

• 2

• 1

• 4

Answer explanation

To find the total hundreds in 153 + 172, we first add the numbers: 153 + 172 = 325. The hundreds digit in 325 is 3. Therefore, there are 3 hundreds in total.

245 + 372

• 600

• 517

• 717

• 617

Answer explanation

To solve 245 + 372, add the two numbers: 245 + 372 = 617. Therefore, the correct answer is 617.