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Lesson 2.1ReteachNameGroup Tens as Hundreds 10 There are —ones in this stack. 10 There are —stacks.10 stacks of 10 ones is 100 ones.10 tens — 100 — 1 — hundredWrite how many tens. Circle groups of 10 tens.Write how many hundreds. Write the number.1.Check children’swork.20 tens — 2 hundreds—200 blocks — 40 tens —4 hundreds —400 blocks —2. Reteach Houghton Mifflin Harcourt Publishing CompanyR10Grade 2

Lesson 2.2ReteachNameExplore 3-Digit Numbers 11 tens— 1 hundred 1 ten——10 tens 110 — 12 tens— 1 hundred 2 tens—— 120 —10 tens10 tens 13 tens— 1 hundred 3 tens—— 130 —Circle tens to make 1 hundred. Write the Checknumber in different ways.work. 14 tens1.children’s—14 hundred — tens—140 —2.15 tens—15 hundred — tens—150 —Reteach Houghton Mifflin Harcourt Publishing CompanyR11Grade 2

Lesson 2.3ReteachNameModel 3-Digit NumbersShow 243.HundredsTensOnesWith blocks:In a chart:With a quick picture:HundredsTensOnes243Write how many hundreds, tens, and ones. Possible answers. Then draw a quick picture.are given.Show with1. 1382. 217HundredsTensOnesHundredsTensOnes138217Check children’sdrawings.3. 352Check children’sdrawings.4. 174HundredsTensOnesHundredsTensOnes352174Check children’sdrawings.Reteach Houghton Mifflin Harcourt Publishing CompanyCheck children’sdrawings.R12Grade 2

Lesson 2.4ReteachNameHundreds, Tens, and OnesHow many are there in all?Hundreds 3TensOnes52 hundreds tens — ones——Write how many in the chart.Hundreds Tens OnesWrite the number as hundreds plustens plus ones.323 003252055 — ——3 hundreds 2 tens 5 ones is the same as . —Write how many hundreds, tens, and ones arein the model. Write the number in two ways.1.HundredsTensOnes213 200 — 10 3 ——2.HundredsTensOnes126100 — — 20 6 —Reteach Houghton Mifflin Harcourt Publishing CompanyR13 213 ‚— 126 —‚Grade 2

Lesson 2.5ReteachNamePlace Value to 1,000The value of each digit in 426is shown by its place in the number.HundredsTensOnes4 hundreds2 tens 6 ones 400 —6 — 20 —426Circle the value or the meaning of the underlined digit.1.7828008082.3523 hundreds3 tens3 ones3.7424404004.4199 hundreds9 tens9 ones5.584500505Reteach Houghton Mifflin Harcourt Publishing CompanyR14Grade 2

Lesson 2.6ReteachNameNumber NamesYou can write a number using words.257What is shown with thehundreds blocks?What is shown with thetens and ones blocks?fifty-sevenfifty-sevenSo you write 257 as two hundred.————— two hundred —————— Write the number using words.1.163one hundred sixty-three2.427four hundred twenty-sevenWrite the number.3. two hundred nine4. five hundred seventy-nine209Reteach Houghton Mifflin Harcourt Publishing Company579R15Grade 2

Lesson 2.7ReteachNameDifferent Forms of NumbersThere is more than one way to show and write a number.three hundred sixty-two 3 hundreds 6 tens 2 ones——— 300602 — — —362 —Read the number and draw a quick picture. Possible answersThen write the number in different ways.are shown.1. four hundred thirty-two432 hundreds — tens — ones— 400 — 30 2 —— 432 —2. two hundred seventy-five275 hundreds — tens — ones— 200 — 70 5 ——275 —Reteach Houghton Mifflin Harcourt Publishing CompanyR16Grade 2

Lesson 2.8ReteachNameAlgebra Different Ways toShow NumbersThese two models can both be usedto show the number 124.Hundreds1Tens Ones241 ten has the samevalue as 10 ones.Hundreds1Tens Ones114Write how many hundreds, tens, and ones are in the model.1.132HundredsTens Ones12.3Hundreds21Tens Ones212246HundredsTens Ones2Reteach Houghton Mifflin Harcourt Publishing Company4Hundreds62R17Tens Ones316Grade 2

Lesson 2.9ReteachNameCount On and Count Backby 10 and 10010 less than 234100 less than 2342 hundreds 2 tens 4 ones1 hundred 3 tens 4 ones 224 Notice what digit—changes.10 more than 234 134 —100 more than 2342 hundreds 4 tens 4 ones3 hundreds 3 tens 4 ones 334 — 244 —Write the number.1. 10 more than 7192. 10 less than 246 236 — 729 —3. 100 more than 2914. 100 less than 687 587 — 391 —5. 10 less than 5686. 100 more than 649 558 —Reteach Houghton Mifflin Harcourt Publishing Company 749 —R18Grade 2

Lesson 2.10ReteachNameAlgebra Number PatternsFind a counting pattern.421, 431, 441, 451, n, nWhich digit changes fromnumber to number?401 402 403 404 405 406 407 408 409 410411 412 413 414 415 416 417 418 419 420tensThe digit changes.—421 422 423 424 425 426 427 428 429 430431 432 433 434 435 436 437 438 439 440How does it change?441 442 443 444 445 446 447 448 449 450by — each time451 452 453 454 455 456 457 458 459 460 one461 462 463 464 465 466 467 468 469 470Look at the chart. Findthe next two numbersin the pattern.471 472 473 474 475 476 477 478 479 480481 482 483 484 485 486 487 488 489 490491 492 493 494 495 496 497 498 499 500461471The next two numbers are and . ——Look at the digits to findthe next two numbers.1.937, 947, 957, 967, n, nThe next two numbers are — 977 and 987 .—2.135, 235, 335, 435, n, nThe next two numbers are — 535 and 635 .—Reteach Houghton Mifflin Harcourt Publishing CompanyR19Grade 2

Lesson 2.11ReteachNameProblem Solving CompareNumbersAt the zoo, there are 137 birds and 142 reptiles.Are there more birds or more reptiles at the zoo?Unlock the ProblemWhat do I need to find?What information doI need to use?I need to find if there areThere are birds.—There are � reptiles.—birdsmore or——reptiles.137142Show how to solve the problem.BirdsReptilesThe number of hundreds is the same.There are more tens in the number of reptiles.There are morereptilesat 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?Check children’s drawings.birdsThere are more .Reteach Houghton Mifflin Harcourt Publishing CompanyR20Grade 2

Lesson 2.12ReteachNameAlgebra Compare NumbersTo compare 3-digit numbers, first compare hundreds.C212 112212 has more hundreds than 112.If hundreds are equal, then compare tens.C212 221212 has fewer tens than 221.If hundreds and tens are equal, then compare ones.C212 212Compare the numbers. Write , , or .1.C317 � 634Reteach Houghton Mifflin Harcourt Publishing CompanyR21Grade 2

Reteach R13 Grade 2 Lesson 2.4 Reteach Hundreds, Tens, and Ones . Write the number as hundreds plus tens plus ones. 3 hundreds 2 tens 5 ones is the same as . To compare 3-digit numbers, first compare hundreds. 212 has more hundreds than 112. 212 C 112 I

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