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The highest common factor of the numbers 40 and 30 is 10.
Factors of 30 are: 1, 2, 3, 5, 6, 10, 15, and 30. Factors of 40 are: 1, 2, 4, 5, 8, 10, 20, and 40. Find the greatest factor they both have in common. That is the greatest common factor.
40 and 48's highest common factor is eight.
The GCF is 8.
The HCF of 24, 40 & 72 is... 4 !