SATS How To...
Welcome to the all new SATS How-to page. Here we will teach you valuble techniques that can be applied in your Maths, English & Science SATS exams, whatever the level. Forgotten how to convert a fraction? Unsure about how to plan an essay? Then the SATS How-to is for you!
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| how to round up and down |
If the answer to a calculation gives us an answer which is too accurate to be sensible, we can round the number up or down, according to the level of accuracy we require.
e.g. A Local Education Authority has a total of 14 Secondary Schools under its control. There are 13,540 pupils attending those schools. If we find the average number of students per school, the answer does not make sense;
13540 = 967.14285
14
We cannot have .14285 of a pupil! The answer is therefore rounded down to 967 pupils per school.
Should one of the schools close, we get an answer of
13540 = 1040.5384
13
This is rounded up to 1041
Rule:
Decide what level of accuracy you require.
Look at the number after the one you wish to round off to: in the example we rounded the answer to the nearest whole number, or pupil.
If that number is 5 or greater, round up.
If that number is less than 5, round down.
e.g.
The population of Ariba Island is 90,563.
To the nearest 1,000 this can be written as 91,000
The distance between Glasgow and London is 414 miles.
To the nearest 10 miles, this distance is estimated at 410
Darren Scoot broke the men's 100m running record by completing the distance in 9.4567 seconds.
To the nearest hundredth of a second, this is recorded as 9.46
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