Uploaded March 2025 | Updated September 2026, 2 weeks ago

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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 third week on the show.

Week 1 all number rounds: youtube.com/watch?v=8Ct9fJrU-8U

Week 2 all number rounds: youtube.com/watch?v=3Al_NXmsAhs

Footage copyright Channel 4. Watch live at 2:10pm weekdays or catch up on the Channel 4 app.

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

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

You can also follow Tom on Facebook, Twitter and Instagram @tomrocksmaths.
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Support Tom's work via Patreon here: patreon.com/tomrocksmaths