It is 40.
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gcf(440, 560) = 40 Using prime factorisation: 440 = 2³ x 5 x 11 560 = 2⁴ x 5 x 7 hcf = 2³ x 5 = 40
40, 80, 120, 160, 200, 240, 280, 320, 360, 400, 440, 480, 520, 560, 600, . . .
40, 80, 120, 160, 200, 240, 280, 320, 360, 400, 440, 480, 520, 560.
GCD(125, 225) = 25 GCD(125, 225) = 25 GCD(125, 225) = 25 GCD(125, 225) = 25
GCD: 73