4 (2 x 2 x 2 x 5, 2 x 2 x 7)
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50 and 40's highest common factor is ten.
Common factors of 40 and 45 are: 1 and 5.
The common factors of 40 and 64 are: 1, 2, 4, and 8The highest common factor is 8.
64 and 40's highest common factor is eight.
5040 ÷ 1000 = 5 r 40 1000 ÷ 40 = 25 r 0 ⇒ hcf of 5040 and 1000 is 40.