We have seen this before. Look at the mark scheme for the 2005 Year 5 Optional Test Paper - Q3, Paper B. The children had to round 7.75 and 5.51 to the 'nearest whole number'. The mark scheme says "Do not accept 10.00 OR 10.0 OR 8.00 OR 8.0". Admittedly, they had given an example of 6.01 being rounded to 6, so my Year 5s usually get this right. I do point out to them that the whole numbers are conventionally not written with a decimal component. Similarly, the 2006 Y6 test (Paper B, Q20) had a rounding question where the mark scheme again specified, "Do not accept 129.0 OR 7492.0 OR 51.0 OR any other equivalent answers with zeroes after the decimal point." And Nomad has explained the difference. In the context of rounding - for example, in real life measurements - 5.00 is not the same as 5. 5.00 is a number in the range 4.95 to 5.05 (exclusive), whereas 5 is a number in the range 4.5 to 5.5 (exclusive). I agree with the posters that it seems very pedantic to deny a mark to Y6 children when they clearly have a decent understanding of the concept being tested (rounding), but the mark scheme is correct, and we can't say we weren't warned.