Subtract 25/8 from 10/20
1st number: 10/20, 2nd number: 3 1/8
10/20 - 25/8 is -21/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
10/20 = 10 × 2/20 × 2 = 20/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
25/8 = 25 × 5/8 × 5 = 125/40 - Subtract the two like fractions:
20/40 - 125/40 = 20 - 125/40 = -105/40 - After reducing the fraction, the answer is -21/8
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