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Maths Literacy - Ratios and Percentages
Sequences and series
estimating surds
simplification of fractions
solving quadratic equations
word problems
standard form


Rounding off a decimal number to a given number of decimal places is the quickest way to approximate a number. For example, if you wanted to round off 2,652 527 2 to three decimal places, you would:
1). count three places after the decimal and place a | between the third and fourth numbers

2). round up the third digit if the fourth digit is greater than or equal to 5

3). leave the third digit unchanged if the fourth digit is less than 5

4). if the third digit is 9 and needs to be round up, then the 9 becomes a 0 and the second digit rounded up

So, since the first digit after the | is a 5, we must round up the digit in the third decimal place to a 3 and the final answer of 2,652 527 2 rounded to three decimal places is 2,653.
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