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

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