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# Decimal places

## by Patryk Mamica on Nov 27, 2010

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## Decimal placesPresentation Transcript

• Objective Be able to approximate numbers to a given number of decimal places.
• 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 donâ€™t have to do anything else and we have our answer.
• Round the following number to 1dp
• 6.348 = 6.3 (1dp)
• What if the red number was a 5, 6, 7, 8 or 9?
• Lets look at an example
• 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
• Round the following number to 1dp
• 9.2721 = 9.3 (1dp)
•
• 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?