Group Tens as Hundreds 10 1 100

Name

Grade 2Reteach R10

Lesson 2.1

Reteach

Group Tens as Hundreds

Write how many tens. Circle groups of 10 tens.

Write how many hundreds. Write the number.

1.

2.

There are

10

—

ones in this stack.

There are

10

—

stacks.

10 stacks of 10 ones is 100 ones.

10

—

tens

1

—

hundred

100

—

tens

—

hundreds

—

blocks

—

tens

—

hundreds

—

blocks

Name

Grade 2R11Reteach

Lesson 2.2

Reteach

Explore 3-Digit Numbers

Circle tens to make 1 hundred. Write the

number in different ways.

1.

2.

13

—

tens

1

—

hundred

3

—

tens

130

—

10 tens

11

—

tens

1

—

hundred

1

—

ten

110

—

12

—

tens

1

—

hundred

2

—

tens

120

—

10 tens

—

tens

—

hundred

—

tens

—

tens

—

hundred

—

tens

—

Tens OnesHundreds

Name

Grade 2R12Reteach

Lesson 2.3

Reteach

Model 3-Digit Numbers

Write how many hundreds, tens, and ones.

Show with

. Then draw a quick picture.

1. 138

3. 352

2. 217

4. 174

Show 243.

With blocks:

In a chart: With a quick picture:

Hundreds Tens Ones

2 4 3

Hundreds Tens Ones

TensHundreds Ones

Tens

Hundreds

2

5

3

Ones

Tens OnesHundreds

Name

Grade 2R13Reteach

Lesson 2.4

Reteach

Hundreds, Tens, and Ones

Write how many hundreds, tens, and ones are

in the model. Write the number in two ways.

1.

2.

—

‚

—

‚

How many are there in all?

3

—

hundreds

2

—

tens

5

—

ones

Write how many in the chart.

Write the number as hundreds plus

tens plus ones.

3 hundreds 2 tens 5 ones is the same as

325

—

.

300

—

+

20

—

+

5

—

+

—

+

—

+

—

+

—

Tens OnesHundreds

Name

Grade 2R14Reteach

Lesson 2.5

Reteach

Place Value to 1,000

Circle the value or the meaning of the underlined digit.

1. 782 800 80 8

2. 352 3 hundreds 3 tens 3 ones

3. 742 4 40 400

4. 419 9 hundreds 9 tens 9 ones

5. 584 500 50 5

The value of each digit in 426

is shown by its place in the number.

400

—

4 hundreds 2 tens 6 ones

20

—

6

—

426

Name

Grade 2R15Reteach

Lesson 2.6

Reteach

Number Names

Write the number using words.

1. 163

2. 427

You can write a number using words.

What is shown with the What is shown with the

hundreds blocks? tens and ones blocks?

two hundred

———

fifty-seven

———

So you write 257 as

two hundred fifty-seven

—————

.

Write the number.

3. two hundred nine

4. five hundred seventy-nine

257

Name

Grade 2R16Reteach

Lesson 2.7

Reteach

Different Forms of Numbers

Read the number and draw a quick picture.

Then write the number in different ways.

1. four hundred thirty-two

—

hundreds

—

tens

—

ones

—

+

—

+

—

hundreds

—

tens

—

ones

—

+

—

+

—

There is more than one way to show and write a number.

three hundred sixty-two

3

—

hundreds

6

—

tens

2

—

ones

300

—

+

60

—

+

2

—

362

—

2. two hundred seventy-five

Name

Grade 2R17Reteach

Lesson 2.8

Reteach

Write how many hundreds, tens, and ones are in the model.

1. 132

2. 246

These two models can both be used

to show the number 124.

1 ten has the same

value as 10 ones.

Algebra • Different Ways to

Show Numbers

Hundreds Tens Ones

1 2 4

Hundreds Tens Ones

1 1 14

Hundreds Tens Ones Hundreds Tens Ones

Name

Grade 2Reteach R18

Lesson 2.9

Reteach

Count On and Count Back

by 10 and 100

10 less than 234

2 hundreds 2 tens 4 ones

224

—

10 more than 234

2 hundreds 4 tens 4 ones

244

—

100 less than 234

1 hundred 3 tens 4 ones

134

—

100 more than 234

3 hundreds 3 tens 4 ones

334

—

Write the number.

1. 10 more than 719

—

2. 10 less than 246

—

3. 100 more than 291

—

4. 100 less than 687

—

5. 10 less than 568

—

6. 100 more than 649

—

Notice what digit

changes.

401

402 403 404 405 406 407 408

411 412 413 414 415 416 417 419

421 422 423 424 425 426 428 429

431 432 433 434 435 437 438 439

441 442 443 444 446 447 448 449

451 452 453 455 456 457 458

459

461 462 464 465 466 467 468 469

471 473 474 475 476 477 478 479

482 483 484 485 486 487 488 489

491 492 493 494 495 496 497 498 499

409

420

430

440

450

460

470

480

490

500

410

418

427

436

445

454

463

472

481

Name

Grade 2R19Reteach

Lesson 2.10

Reteach

Algebra • Number Patterns

Find a counting pattern.

421, 431, 441, 451,

n

,

n

Which digit changes from

number to number?

The

tens

—

digit changes.

How does it change?

by

one

—

each time

Look at the chart. Find

the next two numbers

in the pattern.

The next two numbers are

461

—

and

471

—

.

Look at the digits to ﬁnd

the next two numbers.

1. 937, 947, 957, 967,

n

,

n

The next two numbers are

—

and

—

.

2. 135, 235, 335, 435,

n

,

n

The next two numbers are

—

and

—

.

Name

Grade 2R20Reteach

Lesson 2.11

Reteach

Problem Solving • Compare

Numbers

At the zoo, there are 137 birds and 142 reptiles.

Are there more birds or more reptiles at the zoo?

Unlock the Problem

What do I need to ﬁnd?

I need to find if there are

more

birds

—

or

.

What information do

I need to use?

There are

137

—

birds.

There are

142

—

reptiles.

Show how to solve the problem.

Birds Reptiles

The number of hundreds is the same.

There are more tens in the number of reptiles.

There are more

at the zoo.

Draw quick pictures to model the numbers.

1. There are 153 birds and 149 fish at the nature center.

Are there more birds or more fish?

There are more

.

reptiles

Name

Grade 2R21Reteach

Lesson 2.12

Reteach

Algebra • Compare Numbers

To compare 3-digit numbers, ﬁrst compare hundreds.

212 has more hundreds than 112. 212

>

C

112

If hundreds are equal, then compare tens.

212 has fewer tens than 221. 212

<

C

221

If hundreds and tens are equal, then compare ones.

212

C

=

212

Compare the numbers. Write

>

,

<

, or

=

.

1. 317

C

326

2. 582

C

634