Subtract 20/21 from 5/2
1st number: 2 1/2, 2nd number: 20/21
5/2 - 20/21 is 65/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
5/2 = 5 × 21/2 × 21 = 105/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
20/21 = 20 × 2/21 × 2 = 40/42 - Subtract the two like fractions:
105/42 - 40/42 = 105 - 40/42 = 65/42 - In mixed form: 123/42
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