Five-Minute Check (over Lesson 2–3)

Main Idea

Example 1:Add or Subtract Whole Numbers

Example 2:Add or Subtract Whole Numbers

Example 3:Add with Regrouping

Example 4:Subtract with Regrouping

• I will add and subtract multi-digit numbers.

Add or Subtract Whole Numbers

Find 321 + 608.

Check Since 929 is close to the estimate, the answer is reasonable.

Estimate 321 + 608 300 + 600 = 900

321608

+9

321608

+9

321608

+292 9

Step 1Add the ones.

Step 2Add the tens.

Step 3Add the hundreds.

1. A

2. B

3. C

4. D0% 0%0%0%

A. 968

B. 979

C. 988

D. 989

Find 432 + 547.

Add or Subtract Whole Numbers

Find 3,879 – 535.

Estimate 3,879 – 535 3,900 – 500 = 3,400

Check Since 3,344 is close to the estimate, the answer makes sense.

5353,879–

Step 1Subtract the

ones.

Step 2Subtract the

tens.

Step 3Subtract the hundreds

and thousands.

4535

3,879–

4535

3,879–

444 33,

1. A

2. B

3. C

4. D0% 0%0%0%

A. 4,534

B. 4,634

C. 4,644

D. 4,645

Find 4,788 – 254.

Add with Regrouping

The high school band took a trip to Austin to see The Music Man. The music boosters raised $6,253 for the trip, and students paid the remaining $4,986. How much money did the trip cost in all?

Estimate

$6,253 + $4,986 → $6,000 + $5,000 = $11,000

Add with Regrouping

$4,986$6,253

+

Step 1Add the ones.

Step 2Add the tens.

Step 3Add the hundreds. Add the thousands.

9$4,986$6,253

+9

Rename 13 tens as 1 hundred and 3 tens.

3

1

$4,986$6,253

+39

1

2$11,

1

Answer: The trip cost $11,239 in all. The answer is close to the estimate. So, the solution is reasonable.

1. A

2. B

3. C

4. D0% 0%0%0%

A. $12,213

B. $12,412

C. $12,413

D. $13,413

The school raised $5,682 for the seniors to go on their senior trip. The students had to pay the remaining $6,731. How much did the trip cost in all?

Subtract with Regrouping

Find 951 – 787.

Estimate 951 – 787 1,000 – 800 = 200

787951

–4

Step 1 Subtract the ones.

4111 < 7, so rename 5 tens as 4 tens, 10 ones. Then 10 ones + 1 one = 11 ones.

Step 2 Subtract the tens.

787951

–4

4114 < 8, so rename 9 hundreds as 8 hundreds, 10 tens. Then 10 tens + 4 tens = 14 tens.6

814

Step 3 Subtract the hundreds.

787951

–64

411814

1

Subtract with Regrouping

Answer: 951 – 787 = 164

1. A

2. B

3. C

4. D0% 0%0%0%

A. 435

B. 433

C. 334

D. 234

Find 823 – 589.

End of the Lesson

Five-Minute Check (over Lesson 2–3)

Image Bank

Math Tool Chest

Add and Subtract Decimals

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 2–3)

Solve. Use the work backward strategy. Marita’s dad made fruit bars for the bake sale. After selling 34, eating 2, and giving away 4, there were 8 fruit bars left over. How many fruit bars did Marita’s dad bake in all?

A. 50 fruit bars

B. 49 fruits bars

C. 48 fruit bars

D. 47 fruit bars