TV presenter Rick Edwards - of Channel 4's T4 - reckons he is a bit of a whizz with numbers.
BBC Radio 4's More or Less put his professed mental arithmetic skills to the test.
More or Less is broadcast on BBC Radio 4 on Fridays at 1330 GMT and repeated on Sundays at 2000 GMT. To listen again, visit the website or subscribe to the podcast.
(Image copyright: Ray Burmiston)
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