Solutions by everydaycalculation.com

The simplest form of -1263 is -421.

- Find the GCD (or HCF) of the absolute values of both numerator and denominator

GCD of 12 and 63 is**3** - Divide both the numerator and denominator by the GCD

-12 ÷ 363 ÷ 3 - Reduced fraction: -421

Therefore, -12/63 simplified to lowest terms is -4/21.

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