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

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