Answers

The simplest form of -645/400 is -129/80.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 645 and 400 is 5
2. Divide both the numerator and denominator by the GCD
   -645 ÷ 5/400 ÷ 5
3. Reduced fraction: -129/80
   Therefore, -645/400 simplified to lowest terms is -129/80.

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Fractions Simplifier