The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40. The common factors of 30 and 40 are 1, 2, 5, and 10, and the GCF is 10.
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The factors of 30 are 1, 2, 3, 5, 6, 10, 15, 30
The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40.
Tjerefore the common factors of 30 and 40 are 1,2,5 and 10 The Greatest common factor is 10