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Fractions and Mixed Numbers: Estimating Sums and Differences

Learn how to estimate sums and differences of fractions and mixed numbers. Practice rounding and apply it to real-life scenarios like catering and knitting.

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Fractions and Mixed Numbers: Estimating Sums and Differences

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  1. Transparency 2 Click the mouse button or press the Space Bar to display the answers.

  2. Splash Screen

  3. Example 2-5b Objective Estimate sums and differences of fractions and mixed numbers

  4. Example 2-5b Vocabulary None

  5. Lesson 2 Contents Example 1Fractions Sums and Differences Example 2Fractions Sums and Differences Example 3Mixed Number Sum Example 4Mixed Number Difference

  6. Estimate rounds to . rounds to 1. Example 2-1a Write problem Round each number to nearest half Add Answer: 1/4

  7. Estimate Answer: Example 2-1b 1/4

  8. Estimate rounds to 1. rounds to 0. Example 2-2a Write problem Round each number to nearest half 1 - 0 Subtract Answer: 1 2/4

  9. Estimate Example 2-2b Answer:About 1 2/4

  10. Estimate rounds to 5 Example 2-3a Write problem Larger numbers need to be rounded to whole numbers 5 5 + 9 Answer: 14 rounds to 9 3/4

  11. Estimate Example 2-3b Answer: 10 3/4

  12. Estimate Example 2-4a Write problem Since numbers are smaller round to nearest half number  3 Answer: 4/4

  13. Estimate Example 2-4b Answer: 6 4/4

  14. End of Lesson 2 Assignment

  15. CATERINGA caterer needs to put a -foot submarine sandwich and a -foot long dessert tray end-to-end on a buffet table. About how long does the buffet table need to be? Estimate Example 2-5a The caterer wants to make sure the table is long enough. So, he rounds up. Answer:So, the table needs to be about 14 feet long. 5/5

  16. KNITTINGOn Monday, Stephanie starts knitting a scarf. She knits a length of inches. On Tuesday, Stephanie continues her knitting with an additional length of inches. About how much of the scarf has Stephanie completed in those two days? Example 2-5b * Answer:13 in. 5/5

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