Round each of the following to 1 decimal place
5.31 639.10 8.48 7.57 109.75 
7498 9.243 5.529 0.0081 119.960 
Now add all of your answers together.
Topics: Starter  Approximation  Arithmetic  Rounding
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Previous Day  This starter is for 20 February  Next Day
5.3 639.1 8.5 7.6 109.8 
7498.0 9.2 5.5 0.0 120.0 
Would you have got the same answer if you had added all of the original numbers together then rounded off the answer?
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Do you know how to round negative numbers? If values exactly half way between get rounded up should 37.25 be rounded to 37.2 or 37.3? Does ‘rounded up’ mean rounded to the larger value or the value furthest away from zero?
A system of rounding commonly used in bookkeeping and some computing procedures is called ‘round half to even’. In this system half way values are rounded either up or down in order to make the last digit an even number.
So, for example, 37.25 becomes 37.2, 37.15 also becomes 37.2 and −37.25 becomes −37.2 without any doubt.
This method of rounding is also useful when rounding values in large data sets as it evens out the rounding ups and rounding downs for the half way values.