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17 February 2021, 11:06 | Updated: 17 February 2021, 11:36
Bradley Walsh was left giggling after Mark Labbett confessed he did not know what a composite number was.
The Chase's Mark Labbett was left embarrassed during Monday afternoon's episode when he got a maths question wrong.
Mark – better known as The Beast on the show – is a former maths teacher, but admitted he has "never heard" of composite numbers.
The Chaser was up against contestant Sarah, who moved on to face Mark after earning £4,000 in the cash builder.
During their head-to-head, they were met with the question: "In maths, what is the first composite number?"
The options were two, four and six.
Sarah, 39, guessed the incorrect answer of two after admitting maths was not her strength.
Bradley and the rest of the contestants were sure Mark would get the answer right, but were left shocked when he also answered two.
A mortified Mark told Bradley, who was relishing in his failed answer: "And the answer is in my on-and-off 20 odd years teaching maths, I've never, ever heard the term."
He added to Bradley: "However, you’re just enjoying the fact I got it wrong."
People on Twitter were quick to call Mark out, with some claiming the term is taught in Primary Schools.
One person wrote: "Beast hasn’t heard of composite numbers… really?"
Another posted: "Can’t believe you got a maths question wrong."
During the episode, Mark tweeted to his fans: "So composite numbers are the new way of describing non-prime numbers? Something new to learn :) #thechase."
Many people were quick to defend him, and admitted they also had not known what composite numbers are.
If you're still not sure, the definition for a composite number is: "Composite numbers can be defined as the whole numbers that have more than two factors. Whole numbers that are not prime are composite numbers, because they are divisible by more than two numbers."