Subtract 81/21 from 20/30
1st number: 20/30, 2nd number: 3 18/21
20/30 - 81/21 is -67/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
20/30 = 20 × 7/30 × 7 = 140/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
81/21 = 81 × 10/21 × 10 = 810/210 - Subtract the two like fractions:
140/210 - 810/210 = 140 - 810/210 = -670/210 - After reducing the fraction, the answer is -67/21
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