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Transparency 5 Click the mouse button or press the Space Bar to display the answers.

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Example 5-5b Objective Add and subtract decimals

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Example 5-5b Review Vocabulary Evaluate Find the value of an expression by replacing variables with numerals

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Lesson 5 Contents Example 1Add Decimals Example 2Subtract Decimals Example 3Annex Zeros Example 4Use Decimals to Solve a Problem Example 5Evaluate an Expression

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Example 5-1a Find the sum of 75.6 and 21.3 Answer: 96.9 Add as with whole numbers. 75.6 + 21.3 Write the problem vertically with decimals lined up Put decimal in answer 96.9 1/5

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Example 5-1b Find the sum of 34.6 and 53.2 Answer: 87.8 1/5

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Example 5-2a Find 10.756 – 6.238 Answer: 4.518 4.518 Subtract as with whole numbers – 6.238 10.756 Put decimal in answer 4.518 2/5 Write the problem vertically with decimals lined up

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Example 5-2b Find 24.758 – 18.315 Answer: 6.443 2/5

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Example 5-3a Find 8 – 1.74 Answer: 6.26 Annex zeros 8.00 – 1.74 6.26 8.00 – 1.74 Subtract as with whole numbers Put decimal in answer 6.266.26 6.26 3/5 Write the problem vertically with decimals lined up

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Example 5-3b Find 9 – 3.28 Answer: 5.72 3/5

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Example 5-4a PIZZA Joe’s Pizza Shop sells an average of 89.7 pizzas on Tuesday nights and an average of 210.5 pizzas on Saturday nights. How many more pizzas does Joe’s Pizza Shop sell on Saturdays? – 89.7 Subtract 4/5 Determine a plan to solve the problem Write the problem vertically with decimals lined up Remember when subtracting: Big number - small number 210.5

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Example 5-4a PIZZA Joe’s Pizza Shop sells an average of 89.7 pizzas on Tuesday nights and an average of 210.5 pizzas on Saturday nights. How many more pizzas does Joe’s Pizza Shop sell on Saturdays? Answer: 120.8 more pizzas on Saturdays. – 89.7 120.8 4/5 210.5 Put decimal in answer Subtract as with whole numbers

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Example 5-4b MOVIES The local movie theater sells an average of 65.8 tickets on Thursdays and an average of 288.9 tickets on Saturdays. How many more tickets are sold on Saturdays? Answer: 223.1 tickets 4/5

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Example 5-5a ALGEBRA Replace a with 10.75 10.75 – 4.80 a - b Write equation 5/5 10.75 Replace b with 4.8 - Bring down - 4.8 Write the problem vertically with decimals lined up Evaluate a - b if a = 10.75 and b = 4.8

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Example 5-5a ALGEBRA 10.75 – 4.80 5.95 a - b 5.955.955.95 Answer: 5.95 5/5 10.75-4.8 Put decimal in answer Subtract as with whole numbers

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Example 5-5b Answer: 70.13 ALGEBRA * 5/5 Evaluate m + n if m = 40.62 and n = 29.51

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End of Lesson 5 Assignment Lesson 3:5 Adding and Subtracting Decimals 12 - 30 All

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