Rounding Whole Numbers
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Rounding Whole Numbers

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A simple Power Point presentation explaining the basic idea of rounding whole numbers.

A simple Power Point presentation explaining the basic idea of rounding whole numbers.

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Rounding Whole Numbers Rounding Whole Numbers Presentation Transcript

  • Rounding Whole Numbers
    Steven Diaz
    Math Instructor
  • What is rounding?
    To find compatible numbers with similar values as the original numbers, so arithmetic computations are easier to perform (i.e. estimate).
  • Basic Idea
    To round a whole number, we look how close is the number from two compatible numbers of our interest on a number line.
  • Round to nearest tens’ place
    Your compatible numbers are multiples of 10. Example: round 63 to the nearest ten.
    63
    Observe: 63 is closer to 60 to than 70. So, 63 is rounded to 60.
  • Round to nearest hundreds’ place
    Your compatible numbers are multiples of 100. Example: round 374 to the nearest hundred.
    374
    Observe: 374 is closer to 400 than to 300. So, 374 is rounded to 400.
  • Round to nearest thousands’ place
    Your compatible numbers are multiples of 1000. Example: round 1499 to the nearest hundred.
    1499
    Observe: 1499 is closer to 1000 than to 2000. So, 1499 is rounded to 1000.
  • Rounding Without Visuals
    Scenario 1: When a number is at least halfway the distance between two compatible numbers, the digit to the right of the place value that we want to round in the numeral is 5 or higher.
    Example: Round 374 to the nearest hundred.
    3 7 4
    Compatible numbers are multiples of 100. 374 is between 300 and 400.
    Observe: The digit 3 is in the hundreds’ place and the digit to its right is 7, so it means that 374 is closer to 400 than to 300. 374 is rounded to 400.
  • Rounding Without Visuals
    Scenario 2: When a number is less than halfway the distance between two compatible numbers, the digit to the right of the place value that we want to round in the numeral is 4 or lower.
    Example: Round 1499 to the nearest thousand.
    1 4 9 9
    Compatible numbers are multiples of 1000. 1499 is between 1000 and 2000.
    Observe: The digit 1 is in the thousands’ place and the digit to its right is 4, so it means that 1499 is closer to 1000 than to 2000. 1499 is rounded to 1000.