1.3 Rounding Numbers
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Rounding Numbers

In this section, we will be using our knowledge about the place value system to round both whole numbers and decimal numbers. Say your curfew is 10:00pm. You are running a bit late and you arrive home at 10:02pm, 2 minute past your curfew. You could round that time to 10:00pm. Phew, thank goodness for rounding! When rounding numbers, we first focus on the digit in the place we are asked to round. Those digits to the left of this place are left alone. The digit we are focusing on is also left alone if the next digit to the right is less than 5; however, the digit we are focusing on is increased by 1 if the next digit to the right is 5 or more.

Lessons

  • 1.
    Round each number to the nearest: i) ten ii) hundred iii) thousand
    • a)
      8926
  • 2.
    Round each number to the nearest i) tenth ii) hundredth iii) thousandth
  • 3.
    The table below shows the average populations of three islands in Hawaii as recorded between 2008 and 2010. Round each population to the nearest

    Island

    Population

    Oahu

    653 207

    Maui

    144 444

    Kauai

    65 689

  • 4.
    Round each number to the nearest hundred
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Rounding Numbers

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