Subtract 9/21 from 1/3
1/3 - 9/21 is -2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
1/3 = 1 × 7/3 × 7 = 7/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
9/21 = 9 × 1/21 × 1 = 9/21 - Subtract the two like fractions:
7/21 - 9/21 = 7 - 9/21 = -2/21
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