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

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