Subtract 21/81 from 28/5
1st number: 5 3/5, 2nd number: 21/81
28/5 - 21/81 is 721/135.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 5 × 81 = 405,
28/5 = 28 × 81/5 × 81 = 2268/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
21/81 = 21 × 5/81 × 5 = 105/405 - Subtract the two like fractions:
2268/405 - 105/405 = 2268 - 105/405 = 2163/405 - After reducing the fraction, the answer is 721/135
- In mixed form: 546/135
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