Decimal places

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Decimal places

  1. 1. McCourt 2004 Objective Be able to approximate numbers to a given number of decimal places.
  2. 2. McCourt 2004 Round the following number to 1dp 6.348 Firstly, highlight the number to the first number after the decimal point So we have 6.3 But is this the answer? Now look at the number immediately after where we stopped highlighting If this number is a 0, 1, 2, 3 or 4 we don’t have to do anything else and we have our answer.
  3. 3. McCourt 2004 Round the following number to 1dp 6.348 = 6.3 (1dp)
  4. 4. McCourt 2004 What if the red number was a 5, 6, 7, 8 or 9? Lets look at an example
  5. 5. McCourt 2004 Round the following number to 1dp 9.2721 Firstly, highlight the number to the first number after the decimal point So we have 9.2 But is this the answer? Now look at the number immediately after where we stopped highlighting If this number is a 5, 6, 7, 8 or 9 we increase the last digit by one. So 9.2 becomes 9.3
  6. 6. McCourt 2004 Round the following number to 1dp 9.2721 = 9.3 (1dp)
  7. 7. McCourt 2004
  8. 8. McCourt 2004 Write the following numbers correct to 1 decimal place 1) 4.529 2) 17.583 3) 2.336 4) 0.0732 5) 0.8499 6) 32.6678 7) 12.4012 8) 0.07822 9) 143.4273 10) 2.3056 11) 9.7882 12) 1.4911 What about two decimal places? And three?

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