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7–8 Estimating with PercentsMAIN IDEA• Estimate the percent ofa number.EXAMPLES Estimate the Percent of a NumberEstimate 49% of 302.49% is close to or .Round 302 to .of is . 1_ or half means to divide by 2.2So, 49% of 302 is about .Estimate 80% of 1,605.80% is .Round 1,605 to since it is divisible by 10.KEY CONCEPTSPercent-FractionEquivalents20% = 1_525% = 1_430% = 3_1033 1_3 % = 1_340% = 2_550% = 1_260% = 3_566 2_3 % = 2_370% = 7_1075% = 3_480% = 4_590% = 9_10100% = 11_ of 1,600 is .1_or 1 tenth means divide by 10.10 10So, _ 8 of 1,600 is 8 × 160 or .10Thus, 80% of 1,605 is about .Check Your ProgressEstimate each percent.a. 26% of 122 b. 40% of 1,207Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.188 Math Connects, Course 1
7–8EXAMPLEMONEY A CD that originally cost $11.90 is on sale for30% off. If you have $7, would you have enough moneyto buy the CD?To determine whether you have enough money to buy the CD,you need to estimate 70% of .METHOD 1 Use a proportion.70% ≈ 75% or and $11.90 ≈3_4 = _ x12× 33_4 = _ x12Write the proportion.Since 4 × 3 = 12, multiply 3 by 3.× 3x =METHOD 2 Use mental math.Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.HOMEWORKASSIGNMENTPage(s):Exercises:70% = and $11.90 ≈7_ of 12 is 8.4 or .10Since is more than $7, you would not haveenough money.Check Your Progress MONEY A poster that originallycost $14.90 is on sale for 40% off. If you have $10, would youhave enough to buy the poster?Math Connects, Course 1 189
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ContentsCopyright © Glencoe/McGraw
Page 7 and 8:
1-5 Algebra: Variables and Expressi
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C H A P T E R1 Number Patterns and
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Chapter 1 BUILD YOUR VOCABULARYVoca
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1-2 Prime FactorsMAIN IDEA• Find
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1-3Powers and ExponentsMAIN IDEA•
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1-4 Order of OperationsMAIN IDEA•
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1-4ORGANIZE ITOn the Lesson 1-4 tab
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1-5REMEMBER ITIn algebra, thesymbol
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1-6EXAMPLE Find the Rule for a Func
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1-8 Algebra: EquationsMAIN IDEA•
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1-9Algebra: Area FormulasMAIN IDEA
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Chapter 1 BRINGING IT ALL TOGETHER1
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C H A P T E R1ChecklistARE YOU READ
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P T A E RH C2BUILD YOUR VOCABULARYT
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2-1 Problem-Solving Investigation:M
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2-2Step 1 Decide on a scale and . T
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2-2Check Your Progress SNOWFALL Mak
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2-3Check Your Progress INCOME The a
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2-4ORGANIZE ITUnder Lesson 2-4 in y
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2-5 Line PlotsEXAMPLE Display Data
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2-6 MeanMAIN IDEA• Find the mean
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2-7 Median, Mode, and RangeMAIN IDE
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2-7ORGANIZE ITUnder Lesson 2-7 in y
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2-8EXAMPLESSelect an appropriatetyp
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2-9Check Your ProgressGraph -5 on a
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Chapter 2 BRINGING IT ALL TOGETHERW
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C H A P T E R3Operations with Decim
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3-1Representing DecimalsMAIN IDEA
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3-2Comparing and Ordering DecimalsM
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3-3 Rounding DecimalsEXAMPLE Round
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3-4 Estimating Sums and Differences
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3-4Read the ItemThe addends are clu
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3-5WRITE ITExplain in your ownwords
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3-6 Multiplying Decimals by Whole N
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3-7Multiplying DecimalsEXAMPLES Mul
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3-8Dividing Decimals by Whole Numbe
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3-9EXAMPLES Zeros in the Quotient a
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3-10 Problem-Solving Investigation:
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C H A P T E R3ChecklistARE YOU READ
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C H A P T E R4BUILD YOUR VOCABULARY
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4-1A Plan for Problem SolvingMAIN I
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4-1EXAMPLESWRITE ITWhy is the great
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4-2BUILD YOUR VOCABULARY (pages 86-
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4-3 Mixed Numbers and Improper Frac
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4-4 Problem-Solving Investigation:M
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4-5EXAMPLE Find the LCMREVIEW ITWhy
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4-6ORGANIZE ITSummarize ways you ca
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4-7 Writing Decimals as FractionsMA
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4-8 Writing Fractions as DecimalsMA
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4-9Algebra: Ordered Pairs and Funct
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4-9EXAMPLESPETS Amelia feeds her do
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Chapter 4 BRINGING IT ALL TOGETHERM
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C H A P T E R5Operations with Fract
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5-1 Rounding Fractions and Mixed Nu
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5-2Problem-Solving Investigation: A
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5-3®ORGANIZE ITUse the note cards
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5-4Check Your Progresssimplest form
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5-5 Adding and Subtracting Mixed Nu
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5-5REMEMBER ITUse estimation tochec
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5-6REMEMBER ITPlacing fractions ona
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5-7EXAMPLE Simplify Before Multiply
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5-8Check Your Progress WEIGHT A bag
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5-9Find 5 ÷ 1 _6 .5 ÷ 1_6 = _ 5
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5-10EXAMPLEADVENTURE RACING A team
Page 146 and 147: Chapter 5 BRINGING IT ALL TOGETHER5
Page 150 and 151: C H A P T E R5ChecklistARE YOU READ
Page 152 and 153: C H A P T E R6BUILD YOUR VOCABULARY
Page 154 and 155: 6-1 Ratios and RatesMAIN IDEA• Ex
Page 156 and 157: 6-2 Ratio TablesMAIN IDEA• Use ra
Page 158 and 159: 6-2BUILD YOUR VOCABULARY (pages 144
Page 160 and 161: 6-3FOOD You can buy 3 medium pizzas
Page 162 and 163: 6-4Algebra: Solving ProportionsEXAM
Page 164 and 165: 6-4EXAMPLE Solve Using Unit RatesWA
Page 166 and 167: 6-6 Sequences and ExpressionsMAIN I
Page 168 and 169: 6-6EXAMPLETEST EXAMPLE The table sh
Page 170 and 171: 6-7Write an equation to find the to
Page 172 and 173: C H A P T E R6BRINGING IT ALL TOGET
Page 176 and 177: C H A P T E R7Percent and Probabili
Page 178 and 179: Chapter 7 BUILD YOUR VOCABULARYVoca
Page 180 and 181: 7-1Check Your Progress Write each p
Page 182 and 183: 7-2Circle GraphsMAIN IDEA• Sketch
Page 184 and 185: 7-2Which two methods of transportat
Page 186 and 187: 7-3EXAMPLES Write a Decimal as a Pe
Page 190 and 191: 7-5Sample SpacesBUILD YOUR VOCABULA
Page 194 and 195: 7-6REVIEW ITUse mental math to solv
Page 198 and 199: 7-8EXAMPLETEST EXAMPLE Clairesurvey
Page 204 and 205: C H A P T E R8Systems of Measuremen
Page 206 and 207: Chapter 8 BUILD YOUR VOCABULARYVoca
Page 208 and 209: 8-1Check Your Progress CRAYONS Meas
Page 210 and 211: 8-2EXAMPLES Change Units of WeightE
Page 212 and 213: 8-3REMEMBER ITOne centimeter isabou
Page 214 and 215: 8-4Check Your Progress Write the me
Page 216 and 217: 8-6 Changing Metric UnitsEXAMPLES C
Page 218 and 219: 8-7Measures of TimeEXAMPLE Add Unit
Page 221 and 222: 8-8EXAMPLES Give Reasonable Tempera
Page 225 and 226: C H A P T E R8ChecklistARE YOU READ
Page 227 and 228: C H A P T E R9BUILD YOUR VOCABULARY
Page 229 and 230: 9-1 Measuring AnglesMAIN IDEA• Me
Page 231 and 232: 203015030150170109-2Estimating and
Page 233 and 234: 9-3Angle RelationshipsMAIN IDEA•
Page 235 and 236: 9-4 TrianglesBUILD YOUR VOCABULARY
Page 237 and 238: 9-4EXAMPLES Classify a Triangle by
Page 241 and 242: 9-7 Similar and Congruent FiguresMA
Page 243 and 244: 9-7EXAMPLE Identify Similar Figures
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P T A E RH C9ChecklistARE YOU READY
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C H A P T E R10BUILD YOUR VOCABULAR
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10-1PerimeterMAIN IDEA• Find the
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10-2Circles and CircumferenceMAIN I
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10-2Check Your Progress Use a calcu
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10-3Check Your Progress Find the ar
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10-4®ORGANIZE ITWrite the formula
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10-6Volume of Rectangular PrismsMAI
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10-7Surface Area of Rectangular Pri
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C H A P T E R10BRINGING IT ALL TOGE
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Chapter 10 BRINGING IT ALL TOGETHER
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C H A P T E R11Integers and Transfo
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11-1 Ordering IntegersEXAMPLE Compa
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11-2Adding IntegersEXAMPLES Add Int
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11-2KEY CONCEPTAdding Integers The
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11-3WRITE ITThink about the numberl
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11-4Multiplying IntegersEXAMPLES Mu
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11-6Dividing IntegersEXAMPLES Divid
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11-6EXAMPLETEST EXAMPLE A scuba div
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11-7point SStep 1 Start at the orig
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11-8EXAMPLE Graph a TranslationTran
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11-9 ReflectionsMAIN IDEA• Graph
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11-10 RotationsMAIN IDEA• Graph r
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C H A P T E R12Algebra: Properties
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12-1The Distributive PropertyMAIN I
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12-2Simplifying Algebraic Expressio
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12-3Solving Addition EquationsMAIN
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12-1 12-3BUILD YOUR VOCABULARY (pag
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12-4BUILD YOUR VOCABULARY (page 292
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12-5EXAMPLE Solve a Multiplication
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