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30 = 2 x 3 x 5 50 = 2 x 5 x 5 100 = 2 x 2 x 5 x 5 GCF = 2 x 5 = 10
10 = 2 x 5
10 = 2 x 5 20 = 2 x 2 x 5 35 = 5 x 7 GCF = 5
2/9 = 0.2222222222 = 2 x 10^-1 + 2 x 10^-2 + 2 x 10^-3 + 2 x 10^-4 + 2 x 10^-5 + 2 x 10^-6 + 2 x 10^-7 + 2 x 10^-8 + 2 x 10^-9 + 2 x 10^-10
You can use two methods: the sequential factoring or the smaller number method. Sequential (factor tree): 100 divided by 2 equals 50, divided by 2 equals 25, divided by 5 equals 5. 2 x 2 x 5 x 5 = 100 Smaller factors: 100 = 10 x 10 and 10 = 2 x 5 so 100 = (2 x 5) x (2 x 5) = 2 x 2 x 5 x 5