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GCF of 21 and 40 is 1, demonstrated through prime factorization.

Prime factorization of 21 and 40 showing GCF calculation with a black background and blue text, including the Cuemath logo.

Prime factorization of 21 and 40 showing GCF calculation with a black background and blue text, including the Cuemath logo.

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(view all common factors of 40)

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