Subtract 42/30 from 18/21
1st number: 18/21, 2nd number: 1 12/30
18/21 - 42/30 is -19/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
18/21 = 18 × 10/21 × 10 = 180/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210 - Subtract the two like fractions:
180/210 - 294/210 = 180 - 294/210 = -114/210 - After reducing the fraction, the answer is -19/35
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