Subtract 21/20 from 81/35
1st number: 2 11/35, 2nd number: 1 1/20
81/35 - 21/20 is 177/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 35 × 4 = 140,
81/35 = 81 × 4/35 × 4 = 324/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
21/20 = 21 × 7/20 × 7 = 147/140 - Subtract the two like fractions:
324/140 - 147/140 = 324 - 147/140 = 177/140 - In mixed form: 137/140
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