Subtract 21/40 from 5/2
1st number: 2 1/2, 2nd number: 21/40
5/2 - 21/40 is 79/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 2 × 20 = 40,
5/2 = 5 × 20/2 × 20 = 100/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
21/40 = 21 × 1/40 × 1 = 21/40 - Subtract the two like fractions:
100/40 - 21/40 = 100 - 21/40 = 79/40 - In mixed form: 139/40
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