The longest factor string of 100 is: 2*2*5*5=100
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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.
2x2x5
7*5*4*3*2 Is the longest factor string of 840
longest string for 800 =2*2*2*2*2*5*5
The longest factor string for 840 is its prime factorization because prime factors can't be broken down any further.