Subtract 90/20 from 81/5
1st number: 16 1/5, 2nd number: 4 10/20
81/5 - 90/20 is 117/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 5 × 4 = 20,
81/5 = 81 × 4/5 × 4 = 324/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
90/20 = 90 × 1/20 × 1 = 90/20 - Subtract the two like fractions:
324/20 - 90/20 = 324 - 90/20 = 234/20 - After reducing the fraction, the answer is 117/10
- In mixed form: 117/10
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