Subtract 63/20 from 7/81
1st number: 7/81, 2nd number: 3 3/20
7/81 - 63/20 is -4963/1620.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 20 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 81 × 20 = 1620,
7/81 = 7 × 20/81 × 20 = 140/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
63/20 = 63 × 81/20 × 81 = 5103/1620 - Subtract the two like fractions:
140/1620 - 5103/1620 = 140 - 5103/1620 = -4963/1620
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