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."
More top news
Welcome to the Newsweek Quiz - where we'll be testing your knowledge from the last seven days of news here in Wales.
A 9pm watershed ban on adverts that market junk food to children should be introduced, Wales' Health Minister has said.
It'll be an unsettled afternoon across Wales, with blustery winds and heavy rain. Gales expected in many areas.