2 x 2 x 2 x 5 x 5
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The longest factor string is 2x2x2x3x13. It is always best to list your factor string from the least to greatest number.
Since 50 is a factor of 200, it is automatically the GCF.
The longest factor string of 100 is: 2*2*5*5=100
The answer is 2x5x5 or 2x 5 to the 2nd power
2x2x5