Subtract 21/4 from 90/75
1st number: 1 15/75, 2nd number: 5 1/4
90/75 - 21/4 is -81/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 4 is 300
Next, find the equivalent fraction of both fractional numbers with denominator 300 - For the 1st fraction, since 75 × 4 = 300,
90/75 = 90 × 4/75 × 4 = 360/300 - Likewise, for the 2nd fraction, since 4 × 75 = 300,
21/4 = 21 × 75/4 × 75 = 1575/300 - Subtract the two like fractions:
360/300 - 1575/300 = 360 - 1575/300 = -1215/300 - After reducing the fraction, the answer is -81/20
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