How do you find the GCF of $18, 45 m n$ $18, 45mn$ ?

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Answer 1 · 2017-01-29T08:47:41

9

firstly, write down the factors for each number

$factors of 18: {1, 2, 3, 6, 9, 18}$ $"factors of 18: "{1,2,3,6,9,18}$

$factors of 45 m n : {1, 3, 5, 9, 15, 45, m, n}$ $"factors of 45"mn": {1,3,5,9,15,45,m,n}$

now pick out the common factors

${1, 3, 9}$ ${1,3,9}$

$:.GCF=9$