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- Are You Ready for Chapter 14?
- Lesson 1: Add Hundreds
- Lesson 2: Regroup Ones
- Lesson 3: Regroup Tens
- Lesson 4: Problem-Solving Strategy: Make a Table
- Lesson 5: Estimate Sums
- Lesson 6: Subtract Hundreds
- Lesson 7: Regroup Tens
- Lesson 8: Regroup Hundreds
- Lesson 9: Estimate Differences
- Lesson 10: Problem-Solving Investigation: Choose a Strategy
- Chapter 14 Review

Select a hyperlink to go to the corresponding slides.

- I will add numbers in the hundreds.

5

0

0

- How can you solve 500 + 400?

4

0

0

5

0

0

- What addition fact can you use to solve this problem?

4

0

0

5 + 4 = 9

5

0

0

- What is500 + 400?

4

0

0

9

0

0

900

Add.

300 + 200 = ___

500

500 + 100 = ___

600

700 + 200 = ___

900

400 + 400 = ___

800

- I will regroup the ones to add three-digit numbers.

- regroup

1

- How do you solve 611 + 319?

6

1

1

3

1

9

- Add the ones. What is 1 + 9?

6

1

1

3

1

9

10

1

- Regroup. 10 ones is the same as 1 ten. Where do we write the 1?

6

1

1

3

1

9

above the numbers in the tens column

1

- What do we write in the ones place?

6

1

1

3

1

9

0

0

1

- Add the tens. What is 1 + 1 + 1?

6

1

1

3

1

9

3

0

3

1

- Add the hundreds. What is 6 + 3?

6

1

1

3

1

9

9

3

0

9

1

- What is 611 + 319?

6

1

1

3

1

9

9

3

0

930

- Add.

518

+ 239

268

+ 316

732

+ 129

861

757

584

- I will regroup tens to add three-digit numbers.

- How do you solve 399 + 148?

3

9

9

1

4

8

- Add the ones. What is 9 + 8?

3

9

9

1

4

8

17

1

- How do we regroup 17?

3

9

9

1

4

8

7

1 ten and 7 ones

1

- Add the tens. What is1 + 9 + 4?

3

9

9

1

4

8

7

14

1

1

- How do we regroup 14 tens?

3

9

9

1

4

8

4

7

1 hundred and 4 tens

1

1

- Add the hundreds. What is 1 + 3 + 1?

3

9

9

1

4

8

4

5

7

5

1

1

- What is399 + 148?

3

9

9

1

4

8

4

5

7

547

- Add.

482

+ 255

284

+ 243

182

+ 226

408

737

527

- I will make a table to solve problems.

What do I know?

Underline what you know.

What do I need to find?

Circle the question.

How will I solve the problem?

I will make a table to find the time that Sonja will leave.

2

4:30

3

6:30

Make a table.

Sonja’s plane will leave at 6:30.

Look back.Is my answer reasonable?

Flight 1 leaves at 2:30.

Flight 2 leaves at 4:30.

Flight 3 leaves at 6:30.

yes

- Make a table to solve.
- Conner read 1 book every week for 6 weeks. Each book had 100 pages. How many pages did he read in all?

600 pages

- I will estimate the sums of three-digit numbers.

- estimate
- round

678 + 118

- What is 678 rounded to the nearest ten?

680

678 + 118

- What is 118 rounded to the nearest ten?

120

678 + 118

- What is the estimated sum of 678 + 118 to the nearest ten?

680 + 120 = 800

678 + 118

- What is 678 rounded to the nearest hundred?

700

678 + 118

- What is 118 rounded to the nearest hundred?

100

678 + 118

- What is the estimated sum of678 + 118 to the nearest hundred?

700 + 100 = 800

404 + 161

- What is 404 rounded to the nearest ten?

400

404 + 161

- What is 161 rounded to the nearest ten?

160

404 + 161

- What is the estimated sum of404 + 161 to the nearest ten?

400 + 160 = 560

404 + 161

- What is 404 rounded to the nearest hundred?

400

404 + 161

- What is 161 rounded to the nearest hundred?

200

404 + 161

- What is the estimated sum of404 + 161 to the nearest hundred?

400 + 200 = 600

404 + 161

- Which estimate is closer to the exact answer?

rounding to the tens

- I will subtract numbers in the hundreds.

—

- Subtract the ones. What is 0 – 0?

6

0

0

3

0

0

0

0

—

- Subtract the tens. What is 0 – 0?

6

0

0

3

0

0

0

0

0

—

- Subtract the hundreds. What is 6 – 3?

6

0

0

3

0

0

3

0

0

3

—

- When subtracting hundreds, you can ignore the zeros. All that is left is a one-digit number fact which has two zeros after it.

6

0

0

3

0

0

3

0

0

—

- 6 hundreds– 3 hundreds3 hundreds

6

0

0

3

0

0

600– 300300

3

0

0

- Subtract.

500

– 200

400

– 300

700

– 100

600

300

100

- I will regroup tens to subtract three-digit numbers.

regroup

—

—

—

—

- How do you solve 286 – 179?

2

8

6

1

7

9

—

Try to subtract the ones. Can you subtract 9 from 6?

2

8

6

1

7

9

no

—

Regroup the tens. Change one of the tens into ten ones. How many tens does that leave you?

7

2

8

6

1

7

9

8 – 1 = 7

—

How many ones does that give you?

16

7

2

8

6

1

7

9

6 + 10 = 16

—

Now subtract the ones. What is 16 – 9?

16

7

2

8

6

1

7

9

7

7

—

Subtract the tens. What is 7 – 7?

16

7

2

8

6

1

7

9

0

7

0

—

Subtract the hundreds. What is 2 – 1?

16

7

2

8

6

1

7

9

1

0

7

1

—

What is286 – 179?

16

7

2

8

6

1

7

9

1

0

7

107

- Subtract.

998

– 389

753

– 119

873

– 14

859

609

634

- I will regroup hundreds to subtract three-digit numbers.

—

—

—

—

- How do you solve 534 – 152?

5

3

4

1

5

2

—

- Subtract the ones. What is 4 – 2?

5

3

4

1

5

2

2

2

—

- Try to subtract the tens. Can you subtract 5 from 3?

5

3

4

1

5

2

2

no

—

- Regroup the hundreds. Change one of the hundreds into 10 tens. How many hundreds does that leave you?

4

5

3

4

1

5

2

2

5 – 1 = 4

—

- How many tens does that give you?

13

4

5

3

4

1

5

2

2

3 + 10 = 13

—

- Now subtract the tens. What is 13 – 5?

13

4

5

3

4

1

5

2

8

2

8

—

- Subtract the hundreds. What is 4 – 1?

13

4

5

3

4

1

5

2

3

8

2

3

—

- What is534 – 152?

13

4

5

3

4

1

5

2

3

8

2

382

- Subtract.

277

– 194

537

– 356

518

– 65

453

83

181

- I will estimate the difference of three-digit numbers.

434 – 196

- What is 434 rounded to the nearest hundred?

400

434 – 196

- What is 196 rounded to the nearest hundred?

200

434 – 196

- What is the difference between 400 and 200?

400 – 200 = 200

434 – 196

- 434 – 196 is about 200. You have rounded numbers to the hundreds to estimate the solution to the problem.

434 – 196

- What is 434 rounded to the nearest ten?

430

434 – 196

- What is 196 rounded to the nearest ten?

200

434 – 196

- What is the difference between 430 and 200?

430 – 200 = 230

434 – 196

- 434 – 196 is about 230. You have rounded numbers to the tens to estimate the solution to the problem.

598 – 294

- What is 598 rounded to the nearest hundred?

600

598 – 294

- What is 294 rounded to the nearest hundred?

300

598 – 294

- What is the difference between 600 and 300?

600 – 300 = 300

598 – 294

- What is 598 rounded to the nearest ten?

600

598 – 294

- What is 294 rounded to the nearest ten?

290

598 – 294

- What is the difference between 600 and 290?

600 – 290 = 310

598 – 294

- Which estimate is closer to the exact answer?

rounding to the hundreds

- I will choose a strategy to solve the problem.

- What do I know?
- Underline what you know.

- What do I needto find?
- Circle the question.

- How will Isolve the problem?

One way is to work backward.

I have 300 cubes left.

I gave 100 cubes to Rikki.

I gave 200 cubes to Polly.

300 + 100 + 200 = 600

300

+ 100

+ 200

600

I started with 600 cubes.

- Is my answerreasonable?
- 600 – 200 = 400I gave Polly 200 cubes.
- 400 – 100 = 300I gave Rikki 100 cubes.

The answer is correct.

- Choose a strategy. Solve.
- I am a number less than 150. There is a 7 in my ones place. I am greater than 140. What number am I?

147

Complete the sentences.

regroup

To ____________ is to take apart a number and write it a new way.

To ____________ is to change the value of a number into one that is easier to work with.

round

regroup

round

- Solve.

438

– 165

263

– 116

542

+ 239

781

273

147

Image Bank

Math Tools

Regroup Ones

Regroup Tens

Regroup Hundreds