Subtract 42/9 from 81/4
1st number: 20 1/4, 2nd number: 4 6/9
81/4 - 42/9 is 187/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 9 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 4 × 9 = 36,
81/4 = 81 × 9/4 × 9 = 729/36 - Likewise, for the 2nd fraction, since 9 × 4 = 36,
42/9 = 42 × 4/9 × 4 = 168/36 - Subtract the two like fractions:
729/36 - 168/36 = 729 - 168/36 = 561/36 - After reducing the fraction, the answer is 187/12
- In mixed form: 157/12
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