7*5*4*3*2 Is the longest factor string of 840
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2 x 2 x 2 x 2 x 5
what is a factor string with 1 to 144
The longest factor string is 2x2x2x3x13. It is always best to list your factor string from the least to greatest number.
The longest factor string of 100 is: 2*2*5*5=100
6 is not a factor of 80