Solutions by everydaycalculation.com

421 - 2127 is -3763.

- Find the least common denominator or LCM of the two denominators:

LCM of 21 and 27 is**189**

Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,

421 = 4 × 921 × 9 = 36189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,

2127 = 21 × 727 × 7 = 147189 - Subtract the two like fractions:

36189 - 147189 = 36 - 147189 = -111189 - After reducing the fraction, the answer is -3763

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