1. 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

2. 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

3. Round the following number to 1dp
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4. What if the red number was a 5, 6, 7, 8 or 9?
Lets look at an example
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5. 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

6. Round the following number to 1dp
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7. McCourt 2004

8. Write the following numbers correct to 1 decimal place
4.529
17.583
2.336
0.0732
0.8499 7) 8) 9)
10)
11)
12)
What about two decimal places? And three?
McCourt 2004