Subtract 8/20 from 81/30
1st number: 2 21/30, 2nd number: 8/20
81/30 - 8/20 is 23/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
81/30 = 81 × 2/30 × 2 = 162/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
8/20 = 8 × 3/20 × 3 = 24/60 - Subtract the two like fractions:
162/60 - 24/60 = 162 - 24/60 = 138/60 - After reducing the fraction, the answer is 23/10
- In mixed form: 23/10
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