Subtract 7/21 from 7/45
7/45 - 7/21 is -8/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
7/45 = 7 × 7/45 × 7 = 49/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
7/21 = 7 × 15/21 × 15 = 105/315 - Subtract the two like fractions:
49/315 - 105/315 = 49 - 105/315 = -56/315 - After reducing the fraction, the answer is -8/45
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