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Published byLionel Gary Lang Modified over 8 years ago
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Writing Fractions as Decimals What are the parts to a fraction? a b The top part of a fraction is called the NUMERATOR. The bottom part of a fraction is the DENOMINATOR
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To change a fraction to a decimal we….. Divide the numerator by the denominator: Numerator ÷ denominator = decimal
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Try the following using a calculator and record the results on your dry board. 3/8 2/3 0.375 0.66666666 What is the difference between these two answers?
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One ends: 0.375 The other can go on forever: 0.666666666 When a decimal comes to an end, it is called a TERMINATING DECIMAL When a decimal repeats and does not end it is called a REPEATING DECIMAL
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REPEATING DECIMALS: We can rewrite repeating decimals using the bar notation. Place a bar over the repeating numbers to indicate that they repeat forever. 0.66666 = 0.6
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Change each fraction to a decimal. If the decimal is repeating use the bar notation. State whether the decimal is terminating or repeating. -6/11 -0.545454 = -0.54
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2/15 0.1333333 = 0.13
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7/8 0.875
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-5/9 -0.555555 = -0.5
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What if we have a mixed number? How do we change it to a decimal? There are two ways you can solve this. 1. Keep the whole number and change the fraction part to a decimal: 3 ½ = (keep the 3) 1 ÷ 2= 0.5 (change the ½ to a decimal) 3.5
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OR 2. Change the fraction to an improper fraction and then divide: 3 ½ = 7/2 = 7÷ 2 = 3.5
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Try the following: 7 3/10 7.3
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5 1/8 5.125
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8 3/5 8.6
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-6 9/10 -6.9
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What about changing decimals to fractions? How do you think you can change a decimal to a fraction? Think Share Write
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Decimal to Fraction… To change a decimal to a fraction 1. State the decimal correctly: 0.56 = 56 hundredths = 56/100 2. Simplify: 56/100 = 14/25
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Try the following- Change each decimal to a fraction: 0.3 3/10
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Decimal to fraction: 2.8 2 8/10 2 4/5
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Decimal to Fraction: 0.9 9/10
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Decimal to Fraction: 2.66 2 66/100 2 33/50
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You will receive WS 258 Only write your name on this sheet Solve number 1 on your own paper When you hear the timer rotate papers Repeat with teacher directions!
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