Answers

The simplest form of -685/3920 is -137/784.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 685 and 3920 is 5
2. Divide both the numerator and denominator by the GCD
   -685 ÷ 5/3920 ÷ 5
3. Reduced fraction: -137/784
   Therefore, -685/3920 simplified to lowest terms is -137/784.

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