How about 37 cm, or 9 inches, or 5 metres?
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It is to find a whole number which is a multiple of ten to give the nearest ten. The rounding could be to the nearest dozen (12), 25, 50, 100 or any convenient whole number.
Multiply the percentage by 3.6 and then round to the nearest whole number to give the central angle for the wedge.
To round 6.59 to the nearest whole number, you look at the digit immediately to the right of the decimal point, which is 5. Since 5 is equal to or greater than 5, you round the whole number up by 1. Therefore, 6.59 rounded to the nearest whole number is 7.
As the first digit after the decimal point is a 2, we round down to give 13 as the answer.
The first digit after the decimal point is a 3, so we round down to give 19 as the answer.