Decimal places
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Transcript of Decimal places
![Page 1: Decimal places](https://reader030.fdocuments.in/reader030/viewer/2022020307/559c71661a28ab5e708b4651/html5/thumbnails/1.jpg)
McCourt 2004
Objective
Be able to approximate numbers to a given
number of decimal places.
![Page 2: Decimal places](https://reader030.fdocuments.in/reader030/viewer/2022020307/559c71661a28ab5e708b4651/html5/thumbnails/2.jpg)
McCourt 2004
Round the following number to 1dp
6.348Firstly, 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.
![Page 3: Decimal places](https://reader030.fdocuments.in/reader030/viewer/2022020307/559c71661a28ab5e708b4651/html5/thumbnails/3.jpg)
McCourt 2004
Round the following number to 1dp
6.348 = 6.3 (1dp)
![Page 4: Decimal places](https://reader030.fdocuments.in/reader030/viewer/2022020307/559c71661a28ab5e708b4651/html5/thumbnails/4.jpg)
McCourt 2004
What if the red number was a 5, 6, 7, 8 or 9?
Lets look at an example
![Page 5: Decimal places](https://reader030.fdocuments.in/reader030/viewer/2022020307/559c71661a28ab5e708b4651/html5/thumbnails/5.jpg)
McCourt 2004
Round the following number to 1dp
9.2721Firstly, 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
![Page 6: Decimal places](https://reader030.fdocuments.in/reader030/viewer/2022020307/559c71661a28ab5e708b4651/html5/thumbnails/6.jpg)
McCourt 2004
Round the following number to 1dp
9.2721 = 9.3 (1dp)
![Page 7: Decimal places](https://reader030.fdocuments.in/reader030/viewer/2022020307/559c71661a28ab5e708b4651/html5/thumbnails/7.jpg)
McCourt 2004
![Page 8: Decimal places](https://reader030.fdocuments.in/reader030/viewer/2022020307/559c71661a28ab5e708b4651/html5/thumbnails/8.jpg)
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) 12.40128) 0.078229) 143.427310) 2.305611) 9.788212) 1.4911
What about two decimal places? And three?