Answers

The simplest form of -645/672 is -215/224.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 645 and 672 is 3
2. Divide both the numerator and denominator by the GCD
   -645 ÷ 3/672 ÷ 3
3. Reduced fraction: -215/224
   Therefore, -645/672 simplified to lowest terms is -215/224.

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