Subtract 15/20 from 50/70
50/70 - 15/20 is -1/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
50/70 = 50 × 2/70 × 2 = 100/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
15/20 = 15 × 7/20 × 7 = 105/140 - Subtract the two like fractions:
100/140 - 105/140 = 100 - 105/140 = -5/140 - After reducing the fraction, the answer is -1/28
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