Subtract 18/9 from 7/21
1st number: 7/21, 2nd number: 2 0/9
7/21 - 18/9 is -5/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
7/21 = 7 × 3/21 × 3 = 21/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
18/9 = 18 × 7/9 × 7 = 126/63 - Subtract the two like fractions:
21/63 - 126/63 = 21 - 126/63 = -105/63 - After reducing the fraction, the answer is -5/3
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