Solutions by everydaycalculation.com

421 - 2181 is -13189.

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

LCM of 21 and 81 is**567**

Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,

421 = 4 × 2721 × 27 = 108567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,

2181 = 21 × 781 × 7 = 147567 - Subtract the two like fractions:

108567 - 147567 = 108 - 147567 = -39567 - After reducing the fraction, the answer is -13189

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