Subtract 90/72 from 21/42
1st number: 21/42, 2nd number: 1 18/72
21/42 - 90/72 is -3/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 42 × 12 = 504,
21/42 = 21 × 12/42 × 12 = 252/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
90/72 = 90 × 7/72 × 7 = 630/504 - Subtract the two like fractions:
252/504 - 630/504 = 252 - 630/504 = -378/504 - After reducing the fraction, the answer is -3/4
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