Subtract 7/25 from 21/81
21/81 - 7/25 is -14/675.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 25 is 2025
Next, find the equivalent fraction of both fractional numbers with denominator 2025 - For the 1st fraction, since 81 × 25 = 2025,
21/81 = 21 × 25/81 × 25 = 525/2025 - Likewise, for the 2nd fraction, since 25 × 81 = 2025,
7/25 = 7 × 81/25 × 81 = 567/2025 - Subtract the two like fractions:
525/2025 - 567/2025 = 525 - 567/2025 = -42/2025 - After reducing the fraction, the answer is -14/675
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