60,2
30,2,2
15,2,2,2
5,3,2,2,2
120
2,60
2,2,30
2,2,2,15
2,2,2,3,5
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60,2 30,2,2 15,2,2,2 5,3,2,2,2
The largest factor of 120 other than 120 is 60 because 60x2=120 The largest factor of 120 other than 120 is 60 because 60x2=120 The largest factor of 120 other than 120 is 60 because 60x2=120 The largest factor of 120 other than 120 is 60 because 60x2=120
The greatest common factor of the numbers 120 and 180 is 60.
Factor tree of 40: 40 20,2 10,2,2 5,2,2,2
30 is 2*3*5. 120 is 2^3*3*5. As all the prime factors of 120 appear with a smaller or equal multiplicity in 30, 30 is a factor of 120.