Two minute math: GCF

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Can you name the greatest common factor for each set of numbers?

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NumbersGCF
65, 39
1001, 44
90, 45
25, 7555
2^3, 3^2
n, n+1
56, 63, 72
1 googol, 48
24/2, 36/2
2010, (2)(3)(5)(67)
84, 27
432, 168
242, 363
NumbersGCF
72, 28
6, 999
10^6, 5!
117, 63
87, 58
√(900), √(324)
38, 114
64, 4, 32
Atomic number of Helium, Atomic number of Neon
98, 70
Years in a century, Days in a non-leap year
60, 72

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