Subtract 72/84 from 90/5
1st number: 18 0/5, 2nd number: 72/84
90/5 - 72/84 is 120/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 5 × 84 = 420,
90/5 = 90 × 84/5 × 84 = 7560/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
72/84 = 72 × 5/84 × 5 = 360/420 - Subtract the two like fractions:
7560/420 - 360/420 = 7560 - 360/420 = 7200/420 - After reducing the fraction, the answer is 120/7
- In mixed form: 171/7
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