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2015-07-10T11:19:09+08:00

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Stating the factors for 49 & 35 you'll have:
49 - 1, 7, 49
35 - 1, 5, 7, 35
notice that the common factors are 1 &7 in which case 1 is disregarded. GCF would be 7
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2015-07-10T11:25:19+08:00
Get the factors of 49 and 35.

49= 1&49;7&7;
35= 1&35; 7&5

then get the highest number that both numbers had, which is 7.

you could also use the factor tree method.
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