The GCF is 1.
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The highest common factor for 133 and 161 is 7.
It is: 7
To find the greatest common factor (GCF) of 133 and 228, we first need to find the factors of each number. The factors of 133 are 1, 7, 19, and 133. The factors of 228 are 1, 2, 3, 4, 6, 12, 19, 38, 57, 76, 114, and 228. The common factor between the two numbers is 19, making it the greatest common factor of 133 and 228.
The GCF is 7.
There is no common prime factor for 133 and 1000 and so the only number that goes into both is 1.