Rounding Whole Numbers

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

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Rounding Whole Numbers

  1. 1. Rounding Whole Numbers<br />Steven Diaz<br />Math Instructor<br />
  2. 2. What is rounding?<br />To find compatible numbers with similar values as the original numbers, so arithmetic computations are easier to perform (i.e. estimate).<br />
  3. 3. Basic Idea<br />To round a whole number, we look how close is the number from two compatible numbers of our interest on a number line.<br />
  4. 4. Round to nearest tens’ place<br />Your compatible numbers are multiples of 10. Example: round 63 to the nearest ten.<br />63<br />Observe: 63 is closer to 60 to than 70. So, 63 is rounded to 60.<br />
  5. 5. Round to nearest hundreds’ place<br />Your compatible numbers are multiples of 100. Example: round 374 to the nearest hundred.<br />374<br />Observe: 374 is closer to 400 than to 300. So, 374 is rounded to 400.<br />
  6. 6. Round to nearest thousands’ place<br />Your compatible numbers are multiples of 1000. Example: round 1499 to the nearest hundred.<br />1499<br />Observe: 1499 is closer to 1000 than to 2000. So, 1499 is rounded to 1000.<br />
  7. 7. Rounding Without Visuals<br />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.<br />Example: Round 374 to the nearest hundred.<br />3 7 4<br />Compatible numbers are multiples of 100. 374 is between 300 and 400.<br />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.<br />
  8. 8. Rounding Without Visuals<br />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.<br />Example: Round 1499 to the nearest thousand.<br />1 4 9 9<br />Compatible numbers are multiples of 1000. 1499 is between 1000 and 2000.<br />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.<br />

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