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.

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Presentation transcript:

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

Example 1 Round the following to the number of places indicated. a)5·456 (1) b)7·38499 (2) c)8· (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· (hundredth) 0·2 8·000 1·71 Year 7 mathematics: Decimals 31-Jan-16

Rounding Decimals Round of the following to 2 decimal places 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

Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to 2 decimal places 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

Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to 2 decimal places 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

Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to 1 decimal place 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

Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to 1 decimal place 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

Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to the nearest whole number 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

Year 7 mathematics: Decimals 31-Jan-16 Rounding Decimals Round of the following to the nearest whole number 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