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Sec. 1.2 whole number estimation
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Sec. 1.2 whole number estimation

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Transcript

  • 1. Learning Target:Students will learn how to round whole numbers as a method of estimating.
  • 2. Whole Number Estimation- Estimating sum and differences:Round the numbers to the same place value.Examples:1. 27 + 642. 612 - 83
  • 3. Estimate the sum and difference.3. 180 + 914 4. 91 - 49Compare your answers with the person next to you.
  • 4. Round to:200 and 90090 and 50Answer:3. 1,1004. 40
  • 5. - Estimating the product:round the numbers to the place value of their leading digits.- Leading digit: is the first digit at the left of the number.Examples:1. 879 X 31
  • 6. Estimate the product.2. 193 X 4Compare your answer with the person next to you.
  • 7. Round to:200 and 4Answer: 800
  • 8. - Estimating the quotient:look for compatible numbers (round the second # first)- Compatible numbers: these are numbers that make the calculation easier.Example:1. 970 / 4
  • 9. Estimate the quotient.2. 213 / 68Compare your answer with the person next to you.
  • 10. Compatible numbers:210 and 70Answer: 3
  • 11. What is the rule for estimating the:Sum and DifferenceProductQuotient
  • 12. Do you now know how to round whole numbers as a method of estimating?