Splash Screen Chapter 2 Addition Click the mouse or press the space bar to continue. Chapter 2 Addition Click the mouse or press the space bar to continue.

Chapter Menu Lesson 2-1Lesson 2-1Addition Properties Lesson 2-2Lesson 2-2Problem-Solving Skill: Estimate or Exact Answer Lesson 2-3Lesson 2-3Estimate Sums Lesson 2-4Lesson 2-4Two-Digit Addition Lesson 2-5Lesson 2-5Add Money Lesson 2-6Lesson 2-6Problem-Solving Investigation: Choose a Strategy Lesson 2-7Lesson 2-7Three-Digit Addition Lesson 2-8Lesson 2-8Add Greater Numbers 2 2 Addition

Lesson 1 Menu Five-Minute Check (over Chapter 1) Main Idea and Vocabulary California Standards Key Concept: Properties Example 1 Example Addition Properties

2-1 Addition Properties Lesson 1 MI/Vocab I will use addition properties to add whole numbers. Commutative Property of Addition Identity Property of Addition Associative Property of Addition

2-1 Addition Properties 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 Addition Properties

Lesson 1 Ex1 Find the sum. Identify the property. 2-1 Addition Properties = and =

Lesson 1 Ex1 The sum is 12. The order in which the numbers are added does not change the sum. 2-1 Addition Properties Answer: 12; This is the Commutative Property of Addition.

Lesson 1 CYP1 2-1 Addition Properties Which property is shown here? = A.Identity Property B.Commutative Property C.Associative Property D.Personal Property

Lesson 1 Ex2 Jon has 7 pencils, 5 pens, and 3 highlighters. How many writing utensils does Jon have? = = 5 + (7 + 3) Answer: So, Jon has 15 writing utensils in all. 2-1 Addition Properties = = 15

Lesson 1 CYP2 2-1 Addition Properties Monica has 3 red crayons, 6 blue crayons, and 7 purple crayons. How many crayons does Monica have in all? A.15 B.16 C.17 D.18

End of Lesson 1

Lesson 2 Menu Five-Minute Check (over Lesson 2-1) Main Idea California Standards Example 1: Problem-Solving Skill 2-2 Problem-Solving Skill: Estimate or Exact Answer

2-2 Problem-Solving Skill: Estimate or Exact Answer Lesson 2 MI/Vocab I will decide whether an estimate or an exact answer is needed to solve a problem.

2-2 Problem-Solving Skill: Estimate or Exact Answer Lesson 2 Standard 1 Standard 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 Ex1 To 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? 2-2 Problem-Solving Skill: Estimate or Exact Answer

Lesson 2 Ex1 Understand What 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. 2-2 Problem-Solving Skill: Estimate or Exact Answer

Lesson 2 Ex1 Plan You 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. 2-2 Problem-Solving Skill: Estimate or Exact Answer

Lesson 2 Ex1 Solve First, find about how many trees were planted each day. Estimate by rounding to the closest ten. 2-2 Problem-Solving Skill: Estimate or Exact Answer

Lesson 2 Ex1 Solve Then, add. Answer: So, about 90 trees were planted in all. 2-2 Problem-Solving Skill: Estimate or Exact Answer

Lesson 2 Ex1 Check Look back at the problem. If the question asked for an exact answer you would find = 91. The estimate is close to the exact answer. So, the estimate makes sense. 2-2 Problem-Solving Skill: Estimate or Exact Answer

End of Lesson 2

Lesson 3 Menu Five-Minute Check (over Lesson 2-2) Main Idea and Vocabulary California Standards Example 1 Example 2 Example Estimate Sums

2-3 Estimate Sums Lesson 3 MI/Vocab I will estimate sums using rounding and front-end estimation. estimate front-end estimation

2-3 Estimate Sums Lesson 3 Standard 1 Standard 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 Ex1 Kevin 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 Since the question says about how many people, estimate Estimate Sums Step 1 Round each number to the nearest ten.

Lesson 3 Ex1 Step 2 Add. 2-3 Estimate Sums Answer: So, Kevin found about 40 snails in all

Lesson 3 CYP1 2-3 Estimate Sums Joyce invited 16 girls to her birthday party. She invited 11 boys. About how many people did she invite to her birthday party in all? A.27 B.35 C.20 D.30

Lesson 3 Ex2 2-3 Estimate Sums Samir 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 Answer: So, Samir rode his bike about 70 miles

Lesson 3 CYP2 2-3 Estimate Sums Devon wrote 27 sentences for homework on Monday and 14 sentences for homework on Wednesday. Estimate how many sentences he wrote on those two days. A.40 B.41 C.30 D.50

Lesson 3 Ex3 There 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. 2-3 Estimate Sums You need to estimate

Lesson 3 CYP3 2-3 Estimate Sums There are 17 roller coasters and 32 other rides at Cedar Point Amusement Park. About how many rides are there all together? A.49 B.50 C.40 D.45

End of Lesson 3

Lesson 4 Menu Five-Minute Check (over Lesson 2-3) Main Idea and Vocabulary California Standards Example 1 Example 2 Example Two-Digit Addition

2-4 Two-Digit Addition Lesson 4 MI/Vocab I will regroup ones and add two-digit numbers. regroup

2-4 Two-Digit Addition 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 Ex1 Jung found 17 seashells for his collection. His mother found six more. How many seashells do they have in all? 2-4 Two-Digit Addition Step 1 Add the ones

Lesson 4 Ex1 Step 2 Add the tens. 2-4 Two-Digit Addition Answer: So, =

Lesson 4 CYP1 2-4 Two-Digit Addition Jolene collected 19 rubber bands. John collected 8. How many rubber bands do they have in all? A.27 B.25 C.23 D.30

Lesson 4 Ex2 There 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. 2-4 Two-Digit Addition Estimate = 70.

Lesson 4 Ex2 Answer: So, = Two-Digit Addition Check for Reasonableness Compare 71 to the estimate. The answer is reasonable. Add the tens. Add the ones. Add the partial sums

Lesson 4 CYP2 2-4 Two-Digit Addition In 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? A.70 B.60 C.84 D.72

Lesson 4 Ex3 Find the sum of ones + 4 ones = 8 ones Answer: Two-Digit Addition Estimate = tens + 2 tens = 9 tens

Lesson 4 Ex3 2-4 Two-Digit Addition Compare 98 to the estimate. The answer is reasonable. Check for Reasonableness

Lesson 4 CYP3 2-4 Two-Digit Addition Find the sum of A.80 B.88 C.78 D.70

End of Lesson 4

Lesson 5 Menu Five-Minute Check (over Lesson 2-4) Main Idea and Vocabulary California Standards Example 1 Example Add Money

2-5 Add Money Lesson 5 MI/Vocab I will learn to add money. dollar sign ($) cents sign (¢) decimal point

2-5 Add Money 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.

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

Lesson 5 Ex1 Alicia 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¢. 2-5 Add Money Estimate 61¢ + 15¢ 60¢ + 20¢ = 80¢

7 ¢ Lesson 5 Ex1 2-5 Add Money One Way: Add Cents Add the ones. Add the tens. Place the cents sign after the sum. 6 61¢61¢ + 15 ¢

Lesson 5 Ex1 2-5 Add Money Another Way: Add Dollars Answer: So, Alicia paid 76¢ or $0.76 for the two items. $ $0.15 $0.76

Lesson 5 CYP1 2-5 Add Money Seth bought a lollipop for 52¢ and a pack of gum for 36¢. How much money did he spend at the candy store? A.90¢ B.$0.85 C.$0.88 D.80¢

Lesson 5 Ex2 Yin-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 $ Add Money Estimate $16 + $6 $20 + $10 = $30

Lesson 5 Ex2 Add the ones and regroup. Add the tens. Answer: So, Yin-Chin spent $22 on the two DVDs. 2-5 Add Money Place the dollar sign before the sum. Check for Reasonableness The answer $22 is close to the estimate of $30. So, the answer is reasonable. 2 $16$16 + $ 6 1 2$

Lesson 5 CYP2 2-5 Add Money Sadako paid $27 for a CD at the store, and $14 for a CD online. How much did she spend on the two CDs? A.$41 B.$31 C.$50 D.$51

End of Lesson 5

Lesson 6 Menu Five-Minute Check (over Lesson 2-5) Main Idea California Standards Example 1: Problem-Solving Investigation 2-6 Problem-Solving Investigation: Choose a Strategy

2-6 Problem-Solving Investigation: Choose a Strategy Lesson 6 MI/Vocab I will choose the best strategy to solve a problem.

2-6 Problem-Solving Investigation: Choose a Strategy Lesson 6 Standard 1 Standard 3MR1.1 Analyze problems by identifying relationships, distinguishing relevant from irrelevant information, sequencing and prioritizing information, and observing patterns.

2-6 Problem-Solving Investigation: Choose a Strategy Lesson 6 Standard 2 Standard 3NS2.1 Find the sum or difference of two whole numbers between 0 and 10,000.

Lesson 6 Ex1 KIRI: 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. 2-6 Problem-Solving Investigation: Choose a Strategy

Lesson 6 Ex1 Understand What 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. 2-6 Problem-Solving Investigation: Choose a Strategy

Lesson 6 Ex1 Plan You need to find an exact answer. You can use addition and subtraction. 2-6 Problem-Solving Investigation: Choose a Strategy

Lesson 6 Ex1 Solve First, subtract to find out how many fish they kept. 2-6 Problem-Solving Investigation: Choose a Strategy Hour One: 9 – 4 = 5 Hour Two: 16 – 9 = 7

Lesson 6 Ex1 Solve Next, add the total for each hour. 2-6 Problem-Solving Investigation: Choose a Strategy Answer: Kiri and her father caught and kept 12 fish.

Lesson 6 Ex1 Check Look back at the problem. Yes, Kiri and her father caught and kept at least 10 fish. They caught Problem-Solving Investigation: Choose a Strategy

End of Lesson 6

Lesson 7 Menu Five-Minute Check (over Lesson 2-6) Main Idea California Standards Example 1 Example Three-Digit Addition Add Three-Digit Numbers

2-7 Three-Digit Addition Lesson 7 MI/Vocab I will add three-digit numbers and use estimation to check for reasonableness.

2-7 Three-Digit Addition 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.

2-7 Three-Digit Addition Lesson 7 Standard Standard 3MR2.1 Use estimation to verify the reasonableness of calculated results.

You need to add Lesson 7 Ex1 Lynda used 125 minutes of her cell phone minutes last week and 37 minutes this week. How many minutes has she used altogether? 2-7 Three-Digit Addition Estimate

Lesson 7 Ex1 2-7 Three-Digit Addition 5 ones + 7 ones = 12 ones Step 1 Add the ones. Regroup 12 ones as 1 ten and 2 ones. 1 ten + 2 tens + 3 tens = 6 tens Step 2 Add the tens and hundreds. Bring the 1 hundred down. Answer:

Lesson 7 Ex1 2-7 Three-Digit Addition Check for Reasonableness Since the answer 162 is close to the estimate of 170, the answer is reasonable.

Lesson 7 CYP1 2-7 Three-Digit Addition Jesse used 143 minutes of his game trial Monday and 47 minutes Tuesday. How many minutes has he used altogether? A.200 B.189 C.190 D.100

Lesson 7 Ex2 2-7 Three-Digit Addition Celli 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 ones Regroup 11 ones as 1 ten and 1 ones. $ $

Lesson 7 Ex2 2-7 Three-Digit Addition 1 ten + 1 ten + 4 tens = 6 tens Step 2 Add the tens. 4 hundreds + 2 hundreds = 6 hundreds Step 3 Add the hundreds. Answer: Celia spent $6.61. $ $ $ $ $6.$6.

Lesson 7 CYP2 2-7 Three-Digit Addition Julian spent $6.15 at the grocery store and $2.96 at the gas station. How much did he spend in all? A.$9.01 B.$9.11 C.$10.05 D.$8.99

End of Lesson 7

Lesson 8 Menu Five-Minute Check (over Lesson 2-7) Main Idea California Standards Example 1 Example 2 Example Add Greater Numbers

2-8 Add Greater Numbers Lesson 8 MI/Vocab/Standard 1 I will add three- and four-digit numbers with regrouping.

2-8 Add Greater Numbers 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.

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

You need to find 3, ,745. Lesson 8 Ex1 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? 2-8 Add Greater Numbers Estimate3, ,745 3, ,800 6,100

Lesson 8 Ex1 One Way: Partial Sums 2-8 Add Greater Numbers 3, , ,000 6,021 Add ones. Add tens. Add hundreds. Add thousands.

Lesson 8 Ex1 Another Way: Expanded Notation 2-8 Add Greater Numbers 3,276 = 3, ,745 = 2, , ,021

Lesson 8 CYP1 2-8 Add Greater Numbers At the video store there are 3,567 comedies and 2,655 dramas. What is the total number of these two types of videos? A.7,225 B.6,222 C.8,032 D.5,111

Lesson 8 Ex2 California’s 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, , Add Greater Numbers Estimate3, ,427 3, ,400 6,800

Lesson 8 Ex2 2-8 Add Greater Numbers One Way: Partial Sums 3, , ,000 6,854 Add ones. Add tens. Add hundreds. Add thousands.

Lesson 8 Ex2 2-8 Add Greater Numbers Another Way: Expanded Notation 3,427 = 3, ,427 = 3, , ,854

Lesson 8 CYP2 2-8 Add Greater Numbers It 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? A.3,004 B.2,954 C.6,004 D.3,854

Lesson 8 Ex3 Melody and her mother went to the botanical gardens. Her ticket cost $7.50 and her mother’s ticket cost $ Find the total cost. 2-8 Add Greater Numbers Estimate $ $14.75 $10 + $15 = $25 To add money, add as you would with whole numbers.

Lesson 8 Ex3 2-8 Add Greater Numbers Line up the decimal points. Add. Place the dollar sign in front of the dollars. Place the decimal point in the answer. Check for Reasonableness Since $22.25 is close to the estimate of $25, the answer is reasonable. $14.75 $ $. 1 1

Lesson 8 CYP3 2-8 Add Greater Numbers Theresa and her uncle went to the zoo. Her ticket cost $9.50 and her uncle’s cost $ Find the total cost. A.$29.50 B.$30.00 C.$30.75 D.$31.00

End of Lesson 8

2 2 Addition CR Menu Five-Minute Checks Add Three-Digit Numbers

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

2 2 Addition 5Min 1-1 (over Chapter 1) Round 4,571 to the nearest thousand. A.4,000 B.5,500 C.5,550 D.5,000

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

2 2 Addition 5Min 1-3 (over Chapter 1) Round 7,911 to the nearest thousand. A.7,000 B.7,900 C.8,000 D.900

2 2 Addition 5Min 1-4 (over Chapter 1) Round 5,449 to the nearest thousand. A.5,000 B.5,500 C.6,000 D.5,400

2 2 Addition (over Lesson 2-1) 5Min 2-1 Find the sum. Tell which property you used. A.4; Commutative Property B.14; Commutative Property C.14; Associative Property D.4; Associative Property = and =

2 2 Addition (over Lesson 2-1) 5Min 2-2 Find the sum. Tell which property you used. A.6; Identity Property B.6; Commutative Property C.0; Associative Property D.0; Commutative Property = and =

2 2 Addition (over Lesson 2-1) 5Min 2-3 Find the sum. Tell which property you used. A.7; Associative Property B.13; Identity Property C.13; Associative Property D.20; Associative Property (3 + 6) + 4 = and 3 + (6 + 4) =

2 2 Addition (over Lesson 2-2) 5Min 3-1 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? A.estimate; no B.estimate; yes C.exact answer; no D.exact answer; yes

2 2 Addition (over Lesson 2-3) 5Min 4-1 Estimate the sum using rounding. A.70 B.90 C.80 D

2 2 Addition (over Lesson 2-3) 5Min 4-2 Estimate the sum using rounding. A.90 B.88 C.83 D

2 2 Addition (over Lesson 2-3) 5Min 4-3 Estimate the sum using front-end estimation. A.47 B.10 C.40 D

2 2 Addition (over Lesson 2-3) 5Min 4-4 Estimate the sum using front-end estimation. A.50 B.60 C.61 D

2 2 Addition (over Lesson 2-4) 5Min 5-1 Find the sum. A.41 B.40 C.33 D

2 2 Addition (over Lesson 2-4) 5Min 5-2 Find the sum. A.90 B.70 C.95 D

2 2 Addition (over Lesson 2-4) 5Min 5-3 Find the sum. A.71 B.83 C.81 D

2 2 Addition (over Lesson 2-4) 5Min 5-4 Find the sum. A.108 B.88 C.40 D

2 2 Addition (over Lesson 2-4) 5Min 5-5 Find the sum. A.45 B.11 C.34 D

2 2 Addition (over Lesson 2-5) 5Min 6-1 Find the sum. A.39¢ B.32¢ C.75¢ D.31¢ 35¢ + 4¢

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

2 2 Addition (over Lesson 2-5) 5Min 6-3 Find the sum. A.31¢ B.49¢ C.39¢ D.59¢ 41¢ + 8¢

2 2 Addition (over Lesson 2-5) 5Min 6-4 Find the sum. A.80¢ B.83¢ C.73¢ D.74¢ 47¢ + 26¢

2 2 Addition (over Lesson 2-5) 5Min 6-5 Find the sum. A.$0.34 B.$0.13 C.$0.31 D.$0.41 $ $0.08

2 2 Addition (over Lesson 2-6) 5Min 7-1 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? A.no B.yes

2 2 Addition 5Min 8-1 (over Lesson 2-7) Find the sum. Use estimation to check for reasonableness. A.571 B.575 C.669 D

2 2 Addition 5Min 8-2 (over Lesson 2-7) Find the sum. Use estimation to check for reasonableness. A.752 B.656 C.652 D

2 2 Addition 5Min 8-3 (over Lesson 2-7) Find the sum. Use estimation to check for reasonableness. A.$8.88 B.$6.80 C.$8.98 D.$7.08 $ $1.09

2 2 Addition 5Min 8-4 (over Lesson 2-7) Find the sum. Use estimation to check for reasonableness. A.252 B.192 C.250 D

2 2 Addition (over Lesson 2-7) 5Min 8-5 Find the sum. Use estimation to check for reasonableness. A.882 B.626 C.592 D

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