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Select a hyperlink to go to the corresponding slides. Chapter Menu Are You Ready for Chapter 5? Lesson 1:Lesson 1: Add Tens Lesson 2:Lesson 2: Count On Tens and Ones Lesson 3:Lesson 3: Problem-Solving Strategy: Work Backward Lesson 4:Lesson 4: Regroup Ones as Tens Lesson 5:Lesson 5: Add One-Digit Numbers and Two-Digit Numbers Lesson 6:Lesson 6: Add Two-Digit Numbers Lesson 7:Lesson 7: Estimate Sums Lesson 8:Lesson 8: Add Three Two-Digit Numbers Lesson 9:Lesson 9: Problem-Solving Investigation: Choose a Strategy Chapter 5 Review

Introduction—Are You Ready 1

Introduction—Are You Ready 2

Introduction—Are You Ready 3

Introduction—End

Lesson 1—Get Ready 1 I will use addition facts to add tens.

Lesson 1—Get Ready 2

Lesson 1—Teach What is the sum? 9

Lesson 1—Teach Model the following using cubes:

Lesson 1—Teach What is the sum? 90

Lesson 1—Teach What is the sum of 4 ones and 5 ones? 9

Lesson 1—Teach What is the sum of 4 tens and 5 tens? 90

Lesson 1—Check Add

Lesson 1—Check Add

Lesson 1—Check Add

Lesson 1—End

Lesson 2—Get Ready 1 I will count on by tens and ones to find sums.

Lesson 2—Get Ready 2

Lesson 2—Teach Sara has 26 stickers. She gets 3 more.

How can Sara count on to find how many in all? Lesson 2—Teach Count on 3 from

How many stickers are there in all? Lesson 2—Teach

What number sentence tells about Sara’s stickers? Lesson 2—Teach =

Lesson 2—Teach Tom also has 26 stickers. He gets 30 more.

Lesson 2—Teach How can Tom count on to find how many in all? Count on by tens from

How many stickers are there in all? Lesson 2—Teach

What number sentence tells about Tom’s stickers? Lesson 2—Teach = 56

Do Sara and Tom still have the same number of stickers? Lesson 2—Teach no Sara’s StickersTom’s Stickers

Why not? Lesson 2—Teach Tom added more. Sara’s StickersTom’s Stickers

Lesson 2—Check

Count on to add. Write the sum

Lesson 2—Check Count on to add. Write the sum

Lesson 2—Check Count on to add. Write the sum

Lesson 2—End

Lesson 3—Get Ready 1 I will work backward to solve problems.

Lesson 3—Get Ready 2

Lesson 3—Teach

What do I need to know? Underline what you know.

Lesson 3—Teach What do I need to find? Circle the question.

Lesson 3—Teach How will you solve this problem? Work backward.

Lesson 3—Teach Work backward to solve this problem.

Lesson 3—Teach What do we already know? Patty has 2 cards. Hana has 3 cards. Eduardo has 44 cards.

Lesson 3—Teach Start with the number of cards Eduardo has now. Add the cards he gave away.

Lesson 3—Teach 47 Eduardo’s and Hana’s cards 44 cards he has now + 3 Hana’s cards

Lesson 3—Teach 47 Eduardo’s and Hana’s cards + 2 Patty’s cards 49 number of cards Eduardo had in the beginning

Lesson 3—Teach Eduardo started with 49 cards.

Lesson 3—Teach Look back. Does my answer make sense? yes; = 5; = 49

Lesson 3—Check Work backward to solve. Clint has 7 more problems to do in math. He already did 30. How many problems did he have at the start? 37 problems

Lesson 3—End

Lesson 4—Get Ready 1 I will regroup to find sums.

Lesson 4—Get Ready 2 regroup

Vocab 1

Lesson 4—Get Ready 3

Lesson 4—Teach add How can you find out how many cubes there are in all?

Lesson 4—Teach If there are ten or more ones on the workmat, you can regroup them as one ten. regroup

Lesson 4—Teach Are there enough to regroup? regroup yes

Lesson 4—Teach How many ones are still in the ones section? 3

Lesson 4—Teach How many tens are in the tens section? 1

Lesson 4—Teach What number is one ten and three ones? 13

Lesson 4—Check

___ tens ___ ones Did you regroup? What is the sum? 213 yes 33 Add the ones. Add the tens.

Lesson 4—Check ___ tens ___ ones Did you regroup? What is the sum? 17 no 17 Add the ones. Add the tens.

Lesson 4—End

Lesson 5—Get Ready 1 I will add one-digit and two-digit numbers.

Lesson 5—Get Ready 2

Lesson 5—Teach How many cubes? 16

Lesson 5—Teach How many more? 5

Lesson 5—Teach How many ones altogether? 11

Lesson 5—Teach Is 11 more than 10? yes

Lesson 5—Teach Now how many ten-rods altogether? 2

Lesson 5—Teach How many cubes? 1

Lesson 5—Teach What is the number? 21

Lesson 5—Teach How do you know? There are two groups of 10 that equal 20 plus one group of 1. That’s 21.

Lesson 5—Check Add

Lesson 5—End

Lesson 6—Get Ready 1 I will add two-digit numbers.

Lesson 6—Get Ready 2

Lesson 6—Teach Which digits belong in the tens place?

Lesson 6—Teach Which digits belong in the ones place?

Lesson 6—Teach Add the ones

Lesson 6—Teach Add the tens

Lesson 6—Check

Use the workmat to add

Lesson 6—Check Use the workmat to add

Lesson 6—Check Use the workmat to add

Lesson 6—End

Lesson 7—Get Ready 1 I will estimate the sum.

Lesson 7—Get Ready 2 round

Vocab 2

Lesson 7—Get Ready 3

Lesson 7—Get Ready 4

Lesson 7—Teach José has two containers of marbles. He has 13 marbles in one container and 29 in the other. He thinks he has about 40 marbles. How can we use estimation to decide if José is right? Round both numbers. Then add them to find an estimated sum.

Lesson 7—Teach To which ten is 13 rounded?rounded 10

Lesson 7—Teach To which ten is 29 rounded?rounded 30

Lesson 7—Teach What is the estimated sum? = 40

Lesson 7—Teach Was José’s estimate reasonable? yes

Lesson 7—Check

+__ Lesson 7—Check Round each addend to the nearest ten. Estimate the sum

+__ Lesson 7—Check Round each addend to the nearest ten. Estimate the sum

Lesson 7—End

Lesson 8—Get Ready 1 I will add three two-digit numbers.

Lesson 8—Get Ready 2

Lesson 8—Get Ready 3

Lesson 8—Teach Model the addends on the workmat

Lesson 8—Teach Add two addends

Lesson 8—Teach Add this sum to the third addend

Lesson 8—Teach Add the tens

Lesson 8—Check Find the sum

Lesson 8—Check Find the sum

Lesson 8—End

Lesson 9—Get Ready 1 I will choose a strategy to solve a problem.

Lesson 9—Get Ready 2

Lesson 9—Teach What do you know? Underline what you know?

Lesson 9—Teach What do you need to find? Circle the question.

Lesson 9—Teach

How will you solve this problem?

Lesson 9—Teach One way to solve this problem is to guess and check.

Lesson 9—Teach What do we already know? Two numbers have a sum of 16 and a difference of 4.

Lesson 9—Teach How can we make a guess about the answer? Try different numbers and check the sum and difference.

Lesson 9—Teach The sum is right – 8 0 The difference is not 4. This answer is not correct.

Lesson 9—Teach The sum is right – 7 2 The difference is not 4. This answer is not correct.

Lesson 9—Teach The sum is right – 6 4 The difference is 4. This answer is correct.

Lesson 9—Teach 10 and 6 are the numbers.

Lesson 9—Teach Look back. Does my answer make sense? yes

Lesson 9—Check Choose a strategy. Solve. Together Tony and Kerina have 9 pets. Tony has 3 more pets than Kerina. How many pets does Tony have? How many pets does Kerina have? Tony has 6 pets and Kerina has 3 pets.

Lesson 9—End

Chapter Review 1 To ____________ is to change the value of a number into one that is easier to work with. To ____________ is to take apart a number and build it in another way. regroup round Complete the sentences. round regroup

Chapter Review 2 Count on to add. Write the sum

Chapter Review 3 Round each addend to the nearest ten. Estimate the sum. +__

Chapter Review 4 Find the sum

Chapter Review—End