Solutions by everydaycalculation.com

The simplest form of -10420 is -142.

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

GCD of 10 and 420 is**10** - Divide both the numerator and denominator by the GCD

-10 ÷ 10420 ÷ 10 - Reduced fraction: -142

Therefore, -10/420 simplified to lowest terms is -1/42.

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