Noteables Interactive Study Notebook (26491.0K) - McGraw-Hill ...
Noteables Interactive Study Notebook (26491.0K) - McGraw-Hill ... Noteables Interactive Study Notebook (26491.0K) - McGraw-Hill ...
3–5 Adding and Subtracting DecimalsEXAMPLES Add and Subtract DecimalsMAIN IDEA• Add and subtractdecimals.Find the sum of 75.6 and 21.3.Estimate 75.6 + 21.3 ≈ 76 +orREVIEW ITExplain how to estimatethe sum of two decimalsusing rounding.(Lesson 3–4)75.6 Line up the decimal points.____ + 21.3 Add as with whole numbers.The sum of 75.6 and 21.3 is .Compare theanswer to theestimate. Theanswer isreasonable.Find 10.756 - 6.238.Estimate 10.756 - 6.238 ≈- 6 or10.756 Line up the decimal points._____ Subtract as with numbers.So, 10.756 - 6.238 = .Check for Reasonableness: 4.518 ≈ 5 ✔Check Your Progressa. Find the sum of 34.6 and 53.2.b. Find 24.758 - 18.315.Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.66 Math Connects, Course 1
3–5WRITE ITExplain in your ownwords how to find thedifference between awhole number and adecimal.EXAMPLE Annex ZerosFind 8 - 1.74.Estimate 8 - 1.74 ≈ - or8.00 Annex zeros so that both numbers have the____ - 1.74 same place value.So, 8 - 1.74 =. Check for Reasonableness: 6.26 ≈ 6 ✔Check Your Progress Find 9 - 3.28.EXAMPLECopyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.®ORGANIZE ITUnder Lesson 3-5 ofyour Foldable, writea few sentencesexplaining how addingand subtractingdecimals is like addingand subtracting wholenumbers.Chapter 3:OperationswithDecimalsWORLD RECORDS The table shows the diameters ofthree of the largest food items ever created. What is thedifference, in meters, between the world’s largest pizzaand the largest pancake?FoodLargest Food ItemsCountryDiameter(meters)pizza South Africa 37.4pecan pie United States 15.24pancakeSource: Guinness World RecordsUnitedKingdomEstimate 37.4 - 15.01 ≈ - or15.0137.40 Line up the decimal points. Annex a zero.____ - 15.01 Subtract as with whole numbers.Math Connects, Course 1 67
- Page 24 and 25: 1-6EXAMPLE Find the Rule for a Func
- Page 26 and 27: 1-8 Algebra: EquationsMAIN IDEA•
- Page 28 and 29: 1-9Algebra: Area FormulasMAIN IDEA
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- Page 65 and 66: 3-1Representing DecimalsMAIN IDEA
- Page 67 and 68: 3-2Comparing and Ordering DecimalsM
- Page 69 and 70: 3-3 Rounding DecimalsEXAMPLE Round
- Page 71 and 72: 3-4 Estimating Sums and Differences
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3–5 Adding and Subtracting DecimalsEXAMPLES Add and Subtract DecimalsMAIN IDEA• Add and subtractdecimals.Find the sum of 75.6 and 21.3.Estimate 75.6 + 21.3 ≈ 76 +orREVIEW ITExplain how to estimatethe sum of two decimalsusing rounding.(Lesson 3–4)75.6 Line up the decimal points.____ + 21.3 Add as with whole numbers.The sum of 75.6 and 21.3 is .Compare theanswer to theestimate. Theanswer isreasonable.Find 10.756 - 6.238.Estimate 10.756 - 6.238 ≈- 6 or10.756 Line up the decimal points._____ Subtract as with numbers.So, 10.756 - 6.238 = .Check for Reasonableness: 4.518 ≈ 5 ✔Check Your Progressa. Find the sum of 34.6 and 53.2.b. Find 24.758 - 18.315.Copyright © Glencoe/<strong>McGraw</strong>-<strong>Hill</strong>, a division of The <strong>McGraw</strong>-<strong>Hill</strong> Companies, Inc.66 Math Connects, Course 1
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