1, 2, 5, 7, 10, 14, 25, 35, 50, 70, 175, 350
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The factors of -350 are 1, 2, 5, 7, 10, 14, 25, 35, 50, 70, 175, 350 and their negatives.
There's no such thing as a common factor of one number. The word "common" means "same for both". You need at least two numbers, in order to find a factor that's "common" to both of them.
The HCF is: 25
The factors of 3500 are 1, 2, 4, 5, 7, 10, 14, 20, 25, 28, 35, 50, 70, 100, 125, 140, 175, 250, 350, 500, 700, 875, 1750, and 3500. The prime factors of 3500 are 2 x 2 x 5 x 5 x 5 x 7.
Try dividing 350 by 5....
100% = 100/100350% = 350/100 = 35/10 = 7/2