Subtract 50/70 from 21/28
21/28 - 50/70 is 1/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
21/28 = 21 × 5/28 × 5 = 105/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
50/70 = 50 × 2/70 × 2 = 100/140 - Subtract the two like fractions:
105/140 - 100/140 = 105 - 100/140 = 5/140 - After reducing the fraction, the answer is 1/28
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