compare and operation decimal.ppt
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Copyright Ed2Net Learning, Inc.*DecimalsGrade 3
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Copyright Ed2Net Learning, Inc.*Fractions and DecimalsDecimal: A number that uses place-value and a decimal point to show tenths and hundredths, and so on.Examples: $0.25, $0.50, $0.75A decimal point is a period separating the ones and the tenths in a decimal.
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Copyright Ed2Net Learning, Inc.*TenthsYou can use fraction or a decimal to name parts of a whole.Tenth: one of 10 equal parts of a whole0.4Four tenthsTenths GridFractionDecimalWord Name
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Copyright Ed2Net Learning, Inc.*Tenths1.2One and two tenthsTenths GridFraction or Mixed NumberDecimalWord NameRemember: 10/10 = 1; 10 tenths = 1 whole
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Copyright Ed2Net Learning, Inc.*HundredthsHundredth: one of 100 equal parts of a whole0.40Forty hundredthsHundredths GridFractionDecimalWord NameRemember: 10/100 = 1/10;So, 0.4 = 0.40; four tenths = forty hundredths
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Copyright Ed2Net Learning, Inc.*Hundredths1.07One and seven hundredthsHundredths GridFractionDecimalWord NameRemember: 100/100 = 1
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Copyright Ed2Net Learning, Inc.*Equivalent Decimalsfifty hundredthsoneshundredthstenths0.50Five tenthsoneshundredthstenths0.5Decimals that name the same number are called equivalent decimals.
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Copyright Ed2Net Learning, Inc.*Compare & Order DecimalsCompare 2.32 and 2.26Use Place ValueLine up the decimal points. Compare each place, starting at the greatest place.2 . 3 22 . 2 62=23 > 22.32 > 2.26
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Copyright Ed2Net Learning, Inc.*Compare & Order DecimalsCompare 2.32 and 2.26Use Place-Value ChartCompare each place.2=23 > 22.32 > 2.26oneshundredthstenths2.32226.
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Copyright Ed2Net Learning, Inc.*Compare & Order DecimalsCompare 2.32 and 2.26Use Models2.32 > 2.26
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Copyright Ed2Net Learning, Inc.*Compare & Order DecimalsOrder 3.47, 2.26, 3.75Use a number line 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 2.263.473.752.26 < 3.472.26 < 3.753.47 < 3.75
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Copyright Ed2Net Learning, Inc.*Compare & Order DecimalsOrder 3.47, 2.26, 3.75Use Place ValueStep 1Line up the decimal points. Compare the greatest place first.3.472.263.75Think: 2 < 3So, 2.26 is the least.Step 2Compare the next greatest place.
3.473.75
Think: 4 < 7So, 3.47 < 3.75.Step 3Order the decimals from least to greatest.
2.26, 3.47, 3.75
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Copyright Ed2Net Learning, Inc.*Add DecimalsUse modelsAdd 0.5 + 0.7First shade one addend.Then shade the next addend.Find the total.So, 0.5 + 0.7 = 1.2Start shading the second addend right after the first addend.0.5 + 0.7 = 1.2
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Copyright Ed2Net Learning, Inc.*Add DecimalsYou can also add decimals greater than 1.Add 1.18 + 1.23First shade one addend.Then shade the next addend.Find the total.So, 1.18 + 1.23 = 2.411.18 + 1.23 = 2.41
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Copyright Ed2Net Learning, Inc.*Add DecimalsUse Place ValueExample: Add 0.5 + 0.9Step 1: Line up the decimal points. Add the tenths as you would do the whole numbers. Regroup if necessary. 1 0.5+ 0.9 4
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Copyright Ed2Net Learning, Inc.*Add DecimalsStep 2: Add the ones next. Write the decimal point in the sum. 1 0.5+ 0.9 1.4So, 0.5 + 0.9 = 1.4
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Copyright Ed2Net Learning, Inc.*Subtract DecimalsUse modelsSubtract 1.2 0.5First shade 1.2Then take away 0.5Find how many are left.So, 1.2 - 0.5 = 0.7
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Copyright Ed2Net Learning, Inc.*Subtract DecimalsUse models to subtract decimals with hundredthsSubtract 0.68 0.15First shade 0.68Then take away 0.15Find how many are left.So, 0.68 0.15 = 0.53
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Copyright Ed2Net Learning, Inc.*Subtract DecimalsUse Place ValueExample: 1.12 0.35Step 1: Line up the decimal points. Subtract the hundredths first. Regroup if needed. 0 121.12- 0.35 7
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Copyright Ed2Net Learning, Inc.*Subtract DecimalsStep 2: Subtract the tenths next. Regroup if needed. 0 10 0 121.12- 0.35 77
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Copyright Ed2Net Learning, Inc.*Subtract DecimalsStep 3: Subtract the ones next. 0 10 0 121.12- 0.35 0.77
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Copyright Ed2Net Learning, Inc.*Connecting Decimals and Money100 pennies = $1.00
1 = 1/100 of $1.00
1 = $0.01
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Copyright Ed2Net Learning, Inc.*Connecting Decimals and Money5 = 5/100 of a dollar5 cents is 5 hundredths of $1.00= $0.05or 5/100
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Copyright Ed2Net Learning, Inc.*Connecting Decimals and Money10 dimes = $1.00
1 = 10/100 of $1.00
10 = $0.10
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Copyright Ed2Net Learning, Inc.*Connecting Decimals and Money1 dime = 10 = 1/10 of a dollar
10 = $0.10
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Copyright Ed2Net Learning, Inc.*Connecting Decimals and Moneyoneshundredthstenths2.35$2.35 to two dollars and thirty-five centsUse Place ValueRemember:100 pennies = 1 dollar; 1 penny = 1/100 = 0.0110 dimes = 1 dollar; 1 dime = 1/10 = 0.014 quarters = 1 dollar; 1 quarter = 25/100 = 0.25
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Copyright Ed2Net Learning, Inc.*Let us take a break!
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Copyright Ed2Net Learning, Inc.*AssessmentWrite the fraction and the decimal to name each shaded part.
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Copyright Ed2Net Learning, Inc.*AssessmentWrite the fraction and the decimal to name each shaded part.
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Copyright Ed2Net Learning, Inc.*AssessmentWrite sixty-five hundredths as a decimal.Write one and seven tenths as a decimal.Find 2.9 + 4.2Find 9.4 8.3Find 3.6 + 4.5Find 7.4 3.9Jeri ran the 40-yard dash in 6.4 seconds. Bo ran it in 9.3 seconds. How many seconds faster was Jeri than Bo?Find 32/100 of $1.00
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Copyright Ed2Net Learning, Inc.*Great Job!Remember to do the practice sheets!!
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