Subtract 90/10 from 72/15
1st number: 4 12/15, 2nd number: 9 0/10
72/15 - 90/10 is -21/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 10 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 15 × 2 = 30,
72/15 = 72 × 2/15 × 2 = 144/30 - Likewise, for the 2nd fraction, since 10 × 3 = 30,
90/10 = 90 × 3/10 × 3 = 270/30 - Subtract the two like fractions:
144/30 - 270/30 = 144 - 270/30 = -126/30 - After reducing the fraction, the answer is -21/5
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