Oxford University Mathematician Dr Tom Crawford joins the Countdown team as the numbers expert for 3 weeks to cover for Rachel Riley. These are all number rounds from his first week on the show. Watch at 2:10pm weekdays on Channel 4.

Footage copyright Channel 4.

Tom is Public Engagement Lead at the Oxford University Department of Continuing Education: www.conted.ox.ac.uk/profiles/tom-crawford

For more maths content check out Tom's website tomrocksmaths.com/

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