Subtract 81/90 from 49/20
1st number: 2 9/20, 2nd number: 81/90
49/20 - 81/90 is 31/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
49/20 = 49 × 9/20 × 9 = 441/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
81/90 = 81 × 2/90 × 2 = 162/180 - Subtract the two like fractions:
441/180 - 162/180 = 441 - 162/180 = 279/180 - After reducing the fraction, the answer is 31/20
- In mixed form: 111/20
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