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

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