Uploaded March 2025 | Updated September 2026, 2 weeks ago

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The most ridiculous numbers round you'll ever see on Countdown... Using only + - x /, make 903 from 75, 9, 6, 4, 10, 5. Your 30 seconds starts now!

Oxford University Mathematician Dr Tom Crawford joins the Countdown team as the numbers expert for 3 weeks to cover for Rachel Riley. 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: conted.ox.ac.uk/profiles/tom-crawford

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

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