Subtract 28/45 from 9/21
9/21 - 28/45 is -61/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
9/21 = 9 × 15/21 × 15 = 135/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
28/45 = 28 × 7/45 × 7 = 196/315 - Subtract the two like fractions:
135/315 - 196/315 = 135 - 196/315 = -61/315
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