Answers

The simplest form of -1221/2160 is -407/720.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 1221 and 2160 is 3
2. Divide both the numerator and denominator by the GCD
   -1221 ÷ 3/2160 ÷ 3
3. Reduced fraction: -407/720
   Therefore, -1221/2160 simplified to lowest terms is -407/720.

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