Labour education spokesman Kevin Brennan has been mocked after a blunder in the Commons.
The former economics teacher said:
"Only three in 10 pupils - that's 60% because I know the Secretary of State (Michael Gove) is not very good at maths - only three in 10 pupils got a good GCSE in 1997."
Mr Brennan had been attempting to challenge reports that the UK Government was considering ditching GCSEs in favour of a return to O-level style examinations. The slip-up provoked much heckling from the Government front benches.
While Mr Gove was speaking later, Labour MPs questioned his use of statistics but he replied: "I think, given the questions that were put by the Honourable Member, trading percentages across the despatch box is not an area in which Labour can consider themselves to be strong."