ESSENTIAL QUESTION How do you find and use absolute value? 6.NS.3.7, 6.NS.3.7c
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1 ? L E S S O N 1.3 Absolute Value ESSENTIAL QUESTION How do you find and use absolute value? 6.NS.3.7c Understand the absolute value of a rational number interpret absolute value as magnitude in a real-world situation. Also 6.NS.3.7, 6.NS.3.7d EXPLORE ACTIVITY 1 6.NS.3.7, 6.NS.3.7c Finding Absolute Value The absolute value of a number is the number s distance from 0 on a number line. For example, the absolute value of -3 is 3 because -3 is 3 units from 0. The absolute value of -3 is written units = 3 Because absolute value represents a distance, it is always nonnegative. Graph the following numbers on the number line. Then use your number line to find each absolute value A -7 = B 5 = C 7 = D -2 = E 4 = F -4 = Reflect 1. Analyze Relationships Which pairs of numbers have the same absolute value? How are these numbers related? 2. Justify Reasoning Negative numbers are less than positive numbers. Does this mean that the absolute value of a negative number must be less than the absolute value of a positive number? Explain. Lesson
2 Math On the Spot Absolute Value In A Real-World Situation In real-world situations, absolute values are often used instead of negative numbers. For example, if you use a $50 gift card to make a $25 purchase, the change in your gift card balance can be represented by -$25. Animated Math EXAMPLE 1 Jake uses his online music store gift card to buy an album of songs by his favorite band. Find the negative number that represents the change in the balance on Jake's card after his purchase. Explain how absolute value would be used to express that number in this situation. Music Online 6.NS.3.7c Account Balance $25.00 Cart 1 album $10.00 Math Talk Mathematical Practices Explain why the price Jake paid for the album is represented by a negative number. STEP 1 STEP 2 Find the negative integer that represents the change in the balance. -$10 The balance decreased by $10, so use a negative number. Use the number line to find the absolute value of -$ is 10 units from 0 on the number line. 10 units The absolute value of -$10 is $10, or -10 = 10. The balance on Jake's card decreased by $10. Reflect 3. Communicate Mathematical Ideas Explain why the absolute value of a number will never be negative. 20 Unit 1
3 YOUR TURN 4. The temperature at night reached -13 F. Write an equivalent statement about the temperature using the absolute value of the number. Find each absolute value. Personal Math Trainer Online Assessment and Intervention EXPLORE ACTIVITY 2 6.NS.3.7c, 6.NS.3.7d Comparing Absolute Values You can use absolute values to compare negative numbers in real-world situations. Maria, Susan, George, and Antonio checked their credit card balances on their smartphones. The amounts owed are shown. You owe: $20 You owe: $25 You owe: $30 You owe: $45 Answer the following questions. When you have finished, you will have enough clues to match each smartphone with the correct person. Remember: When someone owes a positive amount of money, this means that he or she has a negative balance. A B C D Maria s credit card balance is less than -$30. Does Maria owe more than $30 or less than $30? Susan s credit card balance is greater than -$25. Does Susan owe more than $25 or less than $25? George s credit card balance is $5 less than Susan s balance. Does George owe more than Susan or less than Susan? Antonio owes $15 less than Maria owes. This means that Antonio s Math Coach E balance is than Maria s balance. Write each person s name underneath his or her smartphone. Icon to come Lesson
4 EXPLORE ACTIVITY 2 (cont d) Reflect 11. Analyze Relationships Use absolute value to describe the relationship between a negative credit card balance and the amount owed. Guided Practice 1. Vocabulary If a number is, then the number is less than its absolute value. (Explore Activity 1) 2. If Ryan pays his car insurance for the year in full, he will get a credit of $28. If he chooses to pay a monthly premium, he will pay a $10 late fee for any month that the payment is late. (Explore Activity 1, Example 1) a. Which of these values could be represented with a negative number? Explain. b. Use the number line to find the absolute value of your answer from part a Leo, Gabrielle, Sinea, and Tomas are playing a video game. Their scores are described in the table below. (Explore Activity 2)? Name Leo Gabrielle Sinea Score less than -100 points 20 more points than Leo 50 points less than Leo a. Leo wants to earn enough points to have a positive score. Does he need to earn more than 100 points or less than 100 points? b. Gabrielle wants to earn enough points to not have a negative score. Does she need to earn more points than Leo or less points than Leo? c. Sinea wants to earn enough points to have a higher score than Leo. Does she need to earn more than 50 points or less than 50 points? ESSENTIAL QUESTION CHECK-IN 4. When is the absolute value of a number equal to the number? 22 Unit 1
5 Name Class Date 1.3 Independent Practice 6.NS.3.7, 6.NS.3.7c, 6.NS.3.7d Personal Math Trainer Online Assessment and Intervention 5. Financial Literacy Jacob earned $80 babysitting and deposited the money into his savings account. The next week he spent $85 on video games. Use integers to describe the weekly changes in Jacob s savings account balance. 6. Financial Literacy Sara s savings account balance changed by $34 one week and by -$67 the next week. Which amount represents the greatest change? 7. Analyze Relationships Bertrand collects movie posters. The number of movie posters in his collection changes each month as he buys and sells posters. The table shows how many posters he bought or sold in the given months. Month January February March April Posters Sold 20 Bought 12 Bought 22 Sold 28 a. Which months have changes that can be represented by positive numbers? Which months have changes that can be represented by negative numbers? Explain. b. According to the table, in which month did the size of Bertrand s poster collection change the most? Use absolute value to explain your answer. 8. Earth Science Death Valley has an elevation of -282 feet relative to sea level. Explain how to use absolute value to describe the elevation of Death Valley as a positive integer. Lesson
6 9. Communicate Mathematical Ideas Lisa and Alice are playing a game. Each player either receives or has to pay play money based on the result of their spin. The table lists how much a player receives or pays for various spins. a. Express the amounts in the table as positive and negative numbers. Red Pay $5 Blue Receive $4 Yellow Pay $1 Green Receive $3 Orange Pay $2 b. Describe the change to Lisa s amount of money when the spinner lands on red. 10. Financial Literacy Sam s credit card balance is less than -$36. Does Sam owe more or less than $36? 11. Financial Literacy Emily spent $55 from her savings on a new dress. Explain how to describe the change in Emily s savings balance in two different ways. FOCUS ON HIGHER ORDER THINKING Work Area 12. Make a Conjecture Can two different numbers have the same absolute value? If yes, give an example. If no, explain why not. 13. Communicate Mathematical Ideas Does - -4 = -(-4)? Justify your answer. 14. Critique Reasoning Angelique says that finding the absolute value of a number is the same as finding the opposite of the number. For example, -5 = 5. Explain her error. 24 Unit 1
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