Subtract 84/63 from 18/30
1st number: 18/30, 2nd number: 1 21/63
18/30 - 84/63 is -11/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 63 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 30 × 21 = 630,
18/30 = 18 × 21/30 × 21 = 378/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
84/63 = 84 × 10/63 × 10 = 840/630 - Subtract the two like fractions:
378/630 - 840/630 = 378 - 840/630 = -462/630 - After reducing the fraction, the answer is -11/15
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