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Chapter MenuLesson 2-1Addition PropertiesLesson 2-2Problem-Solving Skill: Estimate or Exact AnswerLesson 2-3Estimate SumsLesson 2-4Two-Digit AdditionLesson 2-5Add MoneyLesson 2-6Problem-Solving Investigation: Choose a StrategyLesson 2-7Three-Digit AdditionLesson 2-8Add Greater Numbers2Addition

Lesson 1 MenuFive-Minute Check (over Chapter 1)Main Idea and VocabularyCalifornia StandardsKey Concept: PropertiesExample 1Example 2

Lesson 1 MI/VocabI will use addition properties to add whole numbers.Commutative Property of AdditionIdentity Property of AdditionAssociative Property of Addition

Lesson 1 Standard Standard 3NS2.1 Find the sum or difference of two whole numbers between 0 and 10,000. Standard 3AF1.1 Represent relationships of quantities in the form of mathematical expressions, equations, or inequalities.

Lesson 1 Key Concept 1

Lesson 1 Ex1Find the sum. Identify the property.

Lesson 1 Ex1The sum is 12. The order in which the numbers are added does not change the sum.Answer: 12; This is the Commutative Property of Addition.

Lesson 1 CYP1Which property is shown here?

4 + 3 = 3 + 4Identity Property Commutative Property Associative Property Personal Property

Lesson 1 Ex2Jon has 7 pencils, 5 pens, and 3 highlighters. How many writing utensils does Jon have? 7 + 5 + 3= 5 + 7 + 3= 5 + (7 + 3)Answer: So, Jon has 15 writing utensils in all.= 5 + 10= 15

Lesson 1 CYP2Monica has 3 red crayons, 6 blue crayons, and 7 purple crayons. How many crayons does Monica have in all?15 16 17 18

End of Lesson 1

Lesson 2 MenuFive-Minute Check (over Lesson 2-1)Main Idea California StandardsExample 1: Problem-Solving Skill

Lesson 2 MI/VocabI will decide whether an estimate or an exact answer is needed to solve a problem.

Lesson 2 Standard 1Standard 3MR2.5 Indicate the relative advantages of exact and approximate solutions to problems and give answers to a specified degree of accuracy. Standard 3NS2.1 Find the sum or difference of two whole numbers between 0 and 10,000.

Lesson 2 Ex1To celebrate Arbor Day, a town planted trees one weekend. On Saturday, 53 trees were planted. Another 38 trees were planted on Sunday. About how many trees were planted in all?

Lesson 2 Ex1UnderstandWhat facts do you know?On Saturday, 53 trees were planted.On Sunday, 38 trees were planted.What do you need to find?Find about how many trees were planted in all.

Lesson 2 Ex1PlanYou need to decide whether to estimate or find an exact answer. Since the question asks about how many trees were planted, you need to estimate.

Lesson 2 Ex1SolveFirst, find about how many trees were planted each day. Estimate by rounding to the closest ten.

Lesson 2 Ex1SolveThen, add.Answer: So, about 90 trees were planted in all.5040+90

Lesson 2 Ex1CheckLook back at the problem. If the question asked for an exact answer you would find 53 + 38 = 91. The estimate is close to the exact answer. So, the estimate makes sense.

End of Lesson 2

Lesson 3 MenuFive-Minute Check (over Lesson 2-2)Main Idea and VocabularyCalifornia Standards Example 1Example 2Example 3

Lesson 3 MI/VocabI will estimate sums using rounding and front-end estimation.estimatefront-end estimation

Lesson 3 Standard 1Standard 6AF1.2 Round off numbers to 10,000 to the nearest ten, hundred, and thousand. Standard 6MR2.4 Find the sum or difference of two whole numbers between 0 and 10,000.

Lesson 3 Ex1Kevin found 14 snails in his backyard after a rain. The next day he found 28 more snails. About how many snails did he find in all?To find the total, find 14 + 28. Since the question says about how many people, estimate 14 + 28.Step 1 Round each number to the nearest ten.

Lesson 3 Ex1Step 2 Add.Answer: So, Kevin found about 40 snails in all.40

Lesson 3 CYP1Joyce invited 16 girls to her birthday party. She invited 11 boys. About how many people did she invite to her birthday party in all?27 35 20 30

Lesson 3 Ex2Samir rode his bike 28 miles on Monday and 43 miles on Tuesday. Estimate how many miles he rode on those two days.You need to estimate 28 + 43.Answer: So, Samir rode his bike about 70 miles.70

Lesson 3 CYP2Devon wrote 27 sentences for homework on Monday and 14 sentences for homework on Wednesday. Estimate how many sentences he wrote on those two days.40 41 30 50

Lesson 3 Ex3There were 65 clowns on the circus floor and 14 acrobats. About how many people were on the circus floor?Answer: So, there were about 80 people on the circus floor.You need to estimate 65 + 14.80

Lesson 3 CYP3There are 17 roller coasters and 32 other rides at Cedar Point Amusement Park. About how many rides are there all together?49 50 40 45

End of Lesson 3

Lesson 4 MenuFive-Minute Check (over Lesson 2-3)Main Idea and VocabularyCalifornia StandardsExample 1Example 2Example 3

Lesson 4 MI/VocabI will regroup ones and add two-digit numbers.regroup

Lesson 4 Standard 1 Standard 3NS2.1 Find the sum or difference of two whole numbers between 0 and 10,000. Standard 3MR2.1 Use estimation to verify the reasonableness of calculated results.

Lesson 4 Ex1Jung found 17 seashells for his collection. His mother found six more. How many seashells do they have in all?Step 1 Add the ones.176+31

Lesson 4 Ex1Step 2 Add the tens.Answer: So, 17 + 6 = 23.2

Lesson 4 CYP1Jolene collected 19 rubber bands. John collected 8. How many rubber bands do they have in all?27 25 23 30

Lesson 4 Ex2There are 34 girls and 37 boys in all the third grade classes. What is the total number of boys and girls in the third grade?You need to add 34 and 37. You can use partial sums.

Lesson 4 Ex2Answer: So, 34 + 37 = 71.Check for ReasonablenessCompare 71 to the estimate. The answer is reasonable.Add the tens.Add the ones.Add the partial sums.3437+6011+71

Lesson 4 CYP2In a survey of the third grade, we found out that 48 students had dogs and 24 had cats. What is the total number of dogs and cats owned by the third graders?70 60 84 72

Lesson 4 Ex3Find the sum of 74 + 24.4 ones + 4 ones = 8 onesAnswer: 987 tens + 2 tens = 9 tens7424+89

Lesson 4 Ex3Compare 98 to the estimate. The answer is reasonable.Check for Reasonableness

Lesson 4 CYP3Find the sum of 45 + 33.80 88 78 70

End of Lesson 4

Lesson 5 MenuFive-Minute Check (over Lesson 2-4)Main Idea and VocabularyCalifornia StandardsExample 1Example 2

Lesson 5 MI/VocabI will learn to add money.dollar sign ($)cents sign ()decimal point

Lesson 5 Standard 1 Standard 3NS3.3 Solve problems involving addition, subtraction, multiplication, and division of money amounts in decimal notation and multiply and divide money amounts in decimal notation by using whole-number multipliers and divisors.

Lesson 5 Standard 2Standard 3MR2.1 Use estimation to verify the reasonableness of calculated results.

Lesson 5 Ex1Alicia bought a pen for 61 and an eraser for 15. How much did she spend for the two items?You need to find the sum of 61 + 15.

Lesson 5 Ex17One Way: Add CentsAdd the ones.Add the tens.Place the cents sign after the sum.6

Lesson 5 Ex1Another Way: Add DollarsAnswer: So, Alicia paid 76 or $0.76 for the two items.$0.76

Lesson 5 CYP1Seth bought a lollipop for 52 and a pack of gum for 36. How much money did he spend at the candy store?90 $0.85 $0.88 80

Lesson 5 Ex2Yin-Chin bought two DVDs. One cost $16, and the other was on sale for $6. How much did Yin-Chin spend for the two DVDs?You need to add $16 and $6.

Lesson 5 Ex2Add the ones and regroup.Add the tens.Answer: So, Yin-Chin spent $22 on the two DVDs.Place the dollar sign before the sum.Check for ReasonablenessThe answer $22 is close to the estimate of $30. So, the answer is reasonable.212$

Lesson 5 CYP2Sadako paid $27 for a CD at the store, and $14 for a CD online. How much did she spend on the two CDs?$41 $31 $50 $51

End of Lesson 5

Lesson 6 MenuFive-Minute Check (over Lesson 2-5)Main IdeaCalifornia StandardsExample 1: Problem-Solving Investigation

Lesson 6 MI/VocabI will choose the best strategy to solve a problem.

Lesson 6 Standard 1Standard 3MR1.1 Analyze problems by identifying relationships, distinguishing relevant from irrelevant information, sequencing and prioritizing information, and observing patterns.

Lesson 6 Standard 2 Standard 3NS2.1 Find the sum or difference of two whole numbers between 0 and 10,000.

Lesson 6 Ex1KIRI: My father and I needed to catch at least 10 fish. During the first hour, we caught 9 fish but threw 4 back. The second hour we caught 16 fish and threw 9 back.

YOUR MISSION: Find out if they caught and kept at least 10 fish.

Lesson 6 Ex1UnderstandWhat facts do you know?During the first hour, they caught 9 fish but threw 4 back.During the second hour, they caught 16 fish and threw 9 back.What do you need to find?Find out if they caught and kept at least 10 fish.

Lesson 6 Ex1PlanYou need to find an exact answer. You can use addition and subtraction.

Lesson 6 Ex1SolveFirst, subtract to find out how many fish they kept.Hour One: 9 4 = 5 Hour Two: 16 9 = 7

Lesson 6 Ex1SolveNext, add the total for each hour.Answer: Kiri and her father caught and kept 12 fish.

Lesson 6 Ex1CheckLook back at the problem. Yes, Kiri and her father caught and kept at least 10 fish. They caught 12.

End of Lesson 6

Lesson 7 MenuFive-Minute Check (over Lesson 2-6)Main IdeaCalifornia StandardsExample 1Example 2

Add Three-Digit Numbers

Lesson 7 MI/VocabI will add three-digit numbers and use estimation to check for reasonableness.

Lesson 7 Standard Standard 3NS3.3 Solve problems involving addition, subtraction, multiplication, and division of money amounts in decimal notation and multiply and divide money amounts in decimal notation by using whole-number multipliers and divisors.

Lesson 7 Standard Standard 3MR2.1 Use estimation to verify the reasonableness of calculated results.

Lesson 7 Ex1You need to add 125 + 37.Lynda used 125 minutes of her cell phone minutes last week and 37 minutes this week. How many minutes has she used altogether?Estimate

Lesson 7 Ex15 ones + 7 ones = 12 onesStep 1 Add the ones.Regroup 12 ones as 1 ten and 2 ones.1 ten + 2 tens + 3 tens = 6 tensStep 2 Add the tens and hundreds.Bring the 1 hundred down.Answer: 16212537+2161

Lesson 7 Ex1Check for ReasonablenessSince the answer 162 is close to the estimate of 170, the answer is reasonable.

Lesson 7 CYP1Jesse used 143 minutes of his game trial Monday and 47 minutes Tuesday. How many minutes has he used altogether?200 189 190 100

Lesson 7 Ex2Celli bought a book for $4.13 and a bookmark for $2.48. How much did she spend?Step 1 Add the ones.3 ones + 8 ones = 11 onesRegroup 11 ones as 1 ten and 1 ones.$4.13+ $2.4811

Lesson 7 Ex21 ten + 1 ten + 4 tens = 6 tensStep 2 Add the tens.4 hundreds + 2 hundreds = 6 hundredsStep 3 Add the hundreds.Answer: Celia spent $6.61.6$6.

Lesson 7 CYP2Julian spent $6.15 at the grocery store and $2.96 at the gas station. How much did he spend in all?$9.01 $9.11 $10.05 $8.99

End of Lesson 7

Lesson 8 MenuFive-Minute Check (over Lesson 2-7)Main IdeaCalifornia StandardsExample 1Example 2Example 3

Lesson 8 MI/Vocab/Standard 1I will add three- and four-digit numbers with regrouping.

Lesson 8 Standard 1 Standard 3NS3.3 Solve problems involving addition, subtraction, multiplication, and division of money amounts in decimal notation and multiply and divide money amounts in decimal notation by using whole-number multipliers and divisors.

Lesson 8 Standard 2 Standard 3MR2.1 Use estimation to verify the reasonableness of calculated results.

Lesson 8 Ex1You need to find 3,276 + 2,745.In the library, there are 3,276 history books and 2,745 science books. What is the total number of these two types of books?Estimate

Lesson 8 Ex1One Way: Partial Sums111109005,0006,021Add ones.Add tens.Add hundreds.Add thousands.

Lesson 8 Ex1Another Way: Expanded Notation5,000 + 900 + 110 + 11900110+ 116,021

Lesson 8 CYP1At the video store there are 3,567 comedies and 2,655 dramas. What is the total number of these two types of videos?7,225 6,222 8,032 5,111

Lesson 8 Ex2Californias tidal shoreline is 3,427 miles long. If you traveled from one end to the other and back, how many miles would you have traveled? Solve using at least two different methods.You need to find 3,427 + 3,427.Estimate

Lesson 8 Ex2One Way: Partial Sums14408006,0006,854Add ones.Add tens.Add hundreds.Add thousands.

Lesson 8 Ex2Another Way: Expanded Notation6,000 + 800 + 40 + 1480040+ 146,854

Lesson 8 CYP2It is 1,927 miles from Houston, Texas to San Francisco, California. If you traveled from one to the other and back, how many miles would you have traveled?3,004 2,954 6,004 3,854

Lesson 8 Ex3Melody and her mother went to the botanical gardens. Her ticket cost $7.50 and her mothers ticket cost $14.75. Find the total cost.To add money, add as you would with whole numbers.

Lesson 8 Ex3Line up the decimal points.Add.Place the dollar sign in front of the dollars.Place the decimal point in the answer.Check for ReasonablenessSince $22.25 is close to the estimate of $25, the answer is reasonable.$14.75$ 7.505+222$.11

Lesson 8 CYP3Theresa and her uncle went to the zoo. Her ticket cost $9.50 and her uncles cost $21.25. Find the total cost.$29.50 $30.00 $30.75 $31.00

End of Lesson 8

2Addition

CR MenuFive-Minute ChecksAdd Three-Digit Numbers

2Addition

5Min MenuLesson 2-1(over Chapter 1)Lesson 2-2(over Lesson 2-1)Lesson 2-3(over Lesson 2-2)Lesson 2-4(over Lesson 2-3)Lesson 2-5(over Lesson 2-4)Lesson 2-6(over Lesson 2-5)Lesson 2-7(over Lesson 2-6)Lesson 2-8(over Lesson 2-7)

2Addition

5Min 1-1 (over Chapter 1)Round 4,571 to the nearest thousand.4,000 5,500 5,550 5,000

2Addition

5Min 1-2 (over Chapter 1)Round 1,278 to the nearest thousand.1,000 1,200 100 1,300

2Addition

5Min 1-3 (over Chapter 1)Round 7,911 to the nearest thousand.7,000 7,900 8,000 900

2Addition

5Min 1-4 (over Chapter 1)Round 5,449 to the nearest thousand.5,000 5,500 6,000 5,400

2Addition

5Min 2-1 (over Lesson 2-1)Find the sum. Tell which property you used. 4; Commutative Property 14; Commutative Property 14; Associative Property 4; Associative Property

2Addition

5Min 2-2 (over Lesson 2-1)Find the sum. Tell which property you used. 6; Identity Property 6; Commutative Property 0; Associative Property 0; Commutative Property

2Addition

5Min 2-3 (over Lesson 2-1)Find the sum. Tell which property you used. 7; Associative Property 13; Identity Property 13; Associative Property 20; Associative Property

2Addition

5Min 3-1 (over Lesson 2-2)Tell whether you need an estimate or an exact answer. Then solve. The school van holds 24 students. Mrs. Lazo has 9 girls and 17 boys in her class. Will the van hold all of the students in the class?estimate; no estimate; yes exact answer; no exact answer; yes

2Addition

5Min 4-1 (over Lesson 2-3)Estimate the sum using rounding.70 90 80 6037 + 41

2Addition

5Min 4-2 (over Lesson 2-3)Estimate the sum using rounding.90 88 83 8065 + 18

2Addition

5Min 4-3 (over Lesson 2-3)Estimate the sum using front-end estimation.47 10 40 5018 + 29

2Addition

5Min 4-4 (over Lesson 2-3)Estimate the sum using front-end estimation.50 60 61 5121 + 40

2Addition

5Min 5-1 (over Lesson 2-4)Find the sum.41 40 33 3437 + 4

2Addition

5Min 5-2 (over Lesson 2-4)Find the sum.90 70 95 10043 + 52

2Addition

5Min 5-3 (over Lesson 2-4)Find the sum.71 83 81 9158 + 23

2Addition

5Min 5-4 (over Lesson 2-4)Find the sum.108 88 40 4864 + 24

2Addition

5Min 5-5 (over Lesson 2-4)Find the sum.45 11 34 3517 + 18

2Addition

5Min 6-1 (over Lesson 2-5)Find the sum.39 32 75 3135 + 4

2Addition

5Min 6-2 (over Lesson 2-5)Find the sum.$36 $46 $48 $10$18 + $28

2Addition

5Min 6-3 (over Lesson 2-5)Find the sum.31 49 39 5941 + 8

2Addition

5Min 6-4 (over Lesson 2-5)Find the sum.80 83 73 7447 + 26

2Addition

5Min 6-5 (over Lesson 2-5)Find the sum.$0.34 $0.13 $0.31 $0.41$0.23 + $0.08

2Addition

5Min 7-1 (over Lesson 2-6)Use one of the problem-solving strategies to solve. The farmer bought 19 cows in May and 26 in June. Did he buy more than 40 cows in all?no yes

2Addition

5Min 8-1 (over Lesson 2-7)Find the sum. Use estimation to check for reasonableness.571 575 669 569302 + 269

2Addition

5Min 8-2 (over Lesson 2-7)Find the sum. Use estimation to check for reasonableness.752 656 652 756172 + 584

2Addition

5Min 8-3 (over Lesson 2-7)Find the sum. Use estimation to check for reasonableness.$8.88 $6.80 $8.98 $7.08$7.89 + $1.09

2Addition

5Min 8-4 (over Lesson 2-7)Find the sum. Use estimation to check for reasonableness.252 192 250 242175 + 67

2Addition

5Min 8-5 (over Lesson 2-7)Find the sum. Use estimation to check for reasonableness.882 626 592 662488 + 174

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