1. Rounding To round off to a decimal: 1.Check how many decimal places you need to round the answer to. a.The question may ask for 1, 2 etc decimal places. b.The question may ask for the nearest tenth, hundredth, etc. 2.Find this decimal place. 3.Look at the number in the next decimal place: a.If the number is 0, 1, 2, 3 or 4: Write the original number to the decimal place required. Leave off all other numbers. b.If the number is 5, 6, 7, 8 or 9 Write the original number to the decimal place required. BUT make the last digit 1 bigger. Year 7 mathematics: Decimals 31-Jan-16

2. Example 1 Round the following to the number of places indicated. a)5·456 (1) b)7·38499 (2) c)8·01950001 (3) 5·5 7·38 8·020 Example 2 Round the following to the number of places indicated. a)0·2499 (tenth) b)7·9998 (thousandth) c)1·714895 (hundredth) 0·2 8·000 1·71 Year 7 mathematics: Decimals 31-Jan-16

3. Rounding Decimals Round of the following to 2 decimal places 12.347 12.34 12.35 12.345 What are the two options for our answer? What decimal is right in the middle? Where does it lie? Which is it closer to? = 12.35

4. Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to 2 decimal places 0.562 0.56 0.57 0.565 What are the two options for our answer? What decimal is right in the middle? Where does it lie? Which is it closer to? = 0.56

5. Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to 2 decimal places 0.499 0.49 0.50 0.495 What are the two options for our answer? What decimal is right in the middle? Where does it lie? Which is it closer to? = 0.50

6. Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to 1 decimal place 0.326 0.3 0.4 0.35 What are the two options for our answer? What decimal is right in the middle? Where does it lie? Which is it closer to? = 0.3

7. Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to 1 decimal place 0.481 0.4 0.5 0.45 What are the two options for our answer? What decimal is right in the middle? Where does it lie? Which is it closer to? = 0.5

8. Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to the nearest whole number 5.83 5 6 5.5 What are the two options for our answer? What decimal is right in the middle? Where does it lie? Which is it closer to? = 6

9. Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to the nearest whole number 7.49 7 8 7.5 What are the two options for our answer? What decimal is right in the middle? Where does it lie? Which is it closer to? = 7