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

RoundingTo 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 9Write the original number to the decimal place required.BUT make the last digit 1 bigger.

Year 7 mathematics: Decimals May 3, 2023

Example 1Round the following to the number of places indicated.a) 5·456 (1)b) 7·38499 (2)c) 8·01950001 (3)

5·57·388·020

Example 2Round the following to the number of places indicated.a) 0·2499 (tenth)b) 7·9998 (thousandth)c) 1·714895 (hundredth)

0·28·0001·71



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


Rounding Decimals


0.562

0.56 0.57 0.565



Where does it lie?


= 0.56


Rounding Decimals


0.499

0.49 0.50 0.495



Where does it lie?


= 0.50


Rounding Decimals

Round of the following to 1 decimal place

0.326

0.3 0.4 0.35



Where does it lie?


= 0.3


Rounding Decimals

Round of the following to 1 decimal place

0.481

0.4 0.5 0.45



Where does it lie?


= 0.5


Rounding Decimals

Round of the following to the nearest whole number

5.83

5 6 5.5



Where does it lie?


= 6


Rounding Decimals

Round of the following to the nearest whole number

7.49

7 8 7.5



Where does it lie?


= 7

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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