Subtracting Rational Numbers
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- Scarlett Cross
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1 . How can you use what you know about subtracting integers to subtract rational numbers? ACTIVITY: Work with a partner. Use a number line to find the difference. a. Then move unit left to end at. Subtract. Start at 0. Move units to the left. 0 b. So, = c. d e ACTIVITY: Finding Distances on a Number Line Work with a partner. a. Plot and on the number line. Then find and ( ). What do you notice about your results? Rational Numbers In this lesson, you will subtract rational numbers. solve real-life problems b. Plot and on the number line. Then find and. What do you notice about your results? 0 c. Choose any two points a and b on a number line. Find the values of a b and b a. What do the absolute values of these differences represent? Is this true for any pair of rational numbers? Explain. 58 Chapter Rational Numbers
2 ACTIVITY: Financial Literacy Work with a partner. The table shows the balance in a checkbook. Black numbers are amounts added to the account. Red numbers are amounts taken from the account. Math Practice Interpret Results What does your answer represent? Does your answer make sense? Date Check # Transaction Amount Balance Previous balance /0/0 Groceries.57 /07/0 Check deposit //0 ATM withdrawal 0.00 //0 5 Electric company 78. /7/0 Music store 0.55 /8/0 6 Shoes 7. //0 Check deposit 5.00 //0 Interest. /5/0 7 Cell phone /6/0 8 Clothes 65.5 /0/0 9 Cable company You can find the balance in the second row two different ways = 65. Subtract.57 from (.57) = 65. Add.57 to a. Copy the table. Then complete the balance column. b. How did you find the balance in the twelfth row? c. Use a different way to find the balance in part (b).. IN YOUR OWN WORDS How can you use what you know about subtracting integers to subtract rational numbers? 5. Give two real-life examples of subtracting rational numbers that are not integers. Use what you learned about subtracting rational numbers to complete Exercises 5 on page 6. Section. 59
3 . Lesson Lesson Tutorials Words To subtract rational numbers, use the same rules for signs as you used for integers. Numbers 5 ( 5) = = + 5 = 5 Find 7 ( 6 7 ). Estimate ( ) = 7 ( 6 7) = = = = 7 = 7 Add the opposite of 6 7. Write the mixed number as an improper fraction. Write the sum of the numerators over the common denominator. Add. Write the improper fraction as a mixed number. The difference is 7. Reasonable? 7 Find =.8 + (.6) Add the opposite of.6. = >.8. So, subtract.8 from.6. The difference is 8.8. Use the sign of.6. Exercises. ( ) ( 0.5) ( 0.07) 60 Chapter Rational Numbers
4 The distance between any two numbers on a number line is the absolute value of the difference of the numbers. Finding Distances Between Numbers on a Number Line 0 Find the distance between the two numbers on the number line. To find the distance between the numbers, first find the difference of the numbers. ) Add the opposite of = ( +. = 8 ( + 7 Write the mixed numbers as improper fractions. ) = 5 Add. = 5 Simplify. Because 5 = 5, the distance between and is 5. Clearance: ft 8 in. Real-Life Application In the water, the bottom of a boat is. feet below the surface, and the top of the boat is 8.7 feet above it. Towed on a trailer, the bottom of the boat is. feet above the ground. Can the boat and trailer pass under the bridge? Step : Find the height h of the boat. h = 8.7 (.) Subtract the lowest point from the highest point. = Add the opposite of.. = 0.8 Add. Step : Find the height t of the boat and trailer. t = =. Add. Add the trailer height to the boat height. Because. feet is greater than feet 8 inches, the boat and trailer cannot pass under the bridge. Exercises 5 7. Find the distance between 7.5 and 5. on a number line. 8. WHAT IF? In Example, the clearance is feet inch. Can the boat and trailer pass under the bridge? Section. 6
5 . Exercises Help with Homework. WRITING Explain how to find the difference WHICH ONE DOESN T BELONG? Which expression does not belong with the other three? Explain your reasoning ( + ) (-6)= +(-)= +(-9)= 9+(-)= Subtract. Write fractions in simplest form ( 7 8) ( 5 9) ( 5.5) ( 8.9). ERROR ANALYSIS Describe and correct the error in finding the difference. 9 = 9 = 6 = Find the distance between the two numbers on a number line.., 5.., , 6. SPORTS DRINK Your sports drink bottle is 5 full. After practice, the bottle is 6 full. Write the difference of the amounts after practice and before practice SUBMARINE The figure shows the depths of a submarine. a. Find the vertical distance traveled by the submarine. b. Find the mean hourly vertical distance traveled by the submarine ft (now) 75.6 ft ( hours ago) Evaluate ( 8 ) ( + 7 9) ( 7.8) (.) ( ) 6 Chapter Rational Numbers
6 . REASONING When is the difference of two decimals an integer? Explain.. RECIPE A cook has cups of flour. A recipe calls for cups of flour. Does the cook have enough flour? If not, how much more flour is needed? mi 8 Springville 5 mi 6 new road Uniontown. ROADWAY A new road that connects Uniontown to Springville is miles long. What is the change in distance when using the new road instead of the dirt roads? RAINFALL In Exercises 6, the bar graph shows the differences in a city s rainfall from the historical average.. What is the difference in Monthly Rainfall rainfall between the wettest and the driest months?.0.0 Historical Average.6 5. Find the sum of the differences for the year. 6. What does the sum in Exercise 5 tell you about the rainfall for the year? Rainfall (inches) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Month 7. OPEN-ENDED Write two different pairs of negative decimals, x and y, that make the statement x y = 0.6 true. REASONING Tell whether the difference between the two numbers is always, sometimes, or never positive. Explain your reasoning. 8. two negative fractions 9. a positive decimal and a negative decimal 0. Fill in the blanks to make the solution correct. 5. (.8 ) =.6 Evaluate. (Skills Review Handbook) MULTIPLE CHOICE A sports store has 6 soccer balls. Over 6 months, it sells 8 soccer balls per month. How many soccer balls are in inventory at the end of the 6 months? (Section. and Section.) A 8 B 8 C 68 D 08 Section. 6
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