Be able to approximate numbers to a given number of decimal places. Objective Be able to approximate numbers to a given number of decimal places. McCourt 2004

Round the following number to 1dp If this number is a 0, 1, 2, 3 or 4 we don’t have to do anything else and we have our answer. Now look at the number immediately after where we stopped highlighting 6.348 Firstly, highlight the number to the first number after the decimal point So we have 6.3 But is this the answer? McCourt 2004

Round the following number to 1dp McCourt 2004

What if the red number was a 5, 6, 7, 8 or 9? Lets look at an example McCourt 2004

Round the following number to 1dp If this number is a 5, 6, 7, 8 or 9 we increase the last digit by one. Now look at the number immediately after where we stopped highlighting 9.2721 Firstly, highlight the number to the first number after the decimal point So we have 9.2 But is this the answer? So 9.2 becomes 9.3 McCourt 2004

Round the following number to 1dp McCourt 2004

McCourt 2004

Write the following numbers correct to 1 decimal place 4.529 17.583 2.336 0.0732 0.8499 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? McCourt 2004