Solutions by everydaycalculation.com

321 - 210 is -235.

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

LCM of 21 and 10 is**210** - For the 1st fraction, since 21 × 10 = 210,

321 = 3 × 1021 × 10 = 30210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,

210 = 2 × 2110 × 21 = 42210 - Subtract the two fractions:

30210 - 42210 = 30 - 42210 = -12210 - After reducing the fraction, the answer is -235

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