Answers

The simplest form of -21/1800 is -7/600.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 21 and 1800 is 3
2. Divide both the numerator and denominator by the GCD
   -21 ÷ 3/1800 ÷ 3
3. Reduced fraction: -7/600
   Therefore, -21/1800 simplified to lowest terms is -7/600.

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