Subtract 75/4 from 18/21
1st number: 18/21, 2nd number: 18 3/4
18/21 - 75/4 is -501/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
18/21 = 18 × 4/21 × 4 = 72/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
75/4 = 75 × 21/4 × 21 = 1575/84 - Subtract the two like fractions:
72/84 - 1575/84 = 72 - 1575/84 = -1503/84 - After reducing the fraction, the answer is -501/28
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