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Decimals Addition and Subtraction: Examples and Practice

Learn how to add and subtract decimals with step-by-step examples. Practice evaluating expressions and solving problems involving decimals.

coryrussell
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Decimals Addition and Subtraction: Examples and Practice

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

  2. Splash Screen

  3. Example 5-5b Objective Add and subtract decimals

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

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

  6. 75.6 + 21.3 Example 5-1a Find the sum of 75.6 and 21.3 Write the problem vertically with decimals lined up 96.9 96.9 96.9 96.9 Put decimal in answer Add as with whole numbers. Answer: 96.9 1/5

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

  8. 10.756 – 6.238 Example 5-2a Write the problem vertically with decimals lined up Find 10.756 – 6.238 Put decimal in answer 4.518 4.518 4.518 4.518 4.518 Subtract as with whole numbers Answer: 4.518 2/5

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

  10. 8.00 8.00 – 1.74 – 1.74 Example 5-3a Write the problem vertically with decimals lined up Find 8 – 1.74 Annex zeros Put decimal in answer 6.26 6.26 6.26 6.26 Subtract as with whole numbers Answer: 6.26 3/5

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

  12. Example 5-4a PIZZAJoe’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? Determine a plan to solve the problem 210.5 Subtract – 89.7 Write the problem vertically with decimals lined up Remember when subtracting: Big number - small number 4/5

  13. Example 5-4a PIZZAJoe’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? Put decimal in answer 210.5 – 89.7 Subtract as with whole numbers 120.8 120.8 120.8 120.8 Answer: 120.8 more pizzas on Saturdays. 4/5

  14. Example 5-4b MOVIESThe 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

  15. 10.75 – 4.80 Example 5-5a ALGEBRA Evaluate a - b if a = 10.75 and b = 4.8 a - b Write equation 10.75 - 4.8 Replace a with 10.75 Bring down - Replace b with 4.8 Write the problem vertically with decimals lined up 5/5

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

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

  18. End of Lesson 5 Assignment

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