Subtract 21/9 from 7/4
1st number: 1 3/4, 2nd number: 2 3/9
7/4 - 21/9 is -7/12.
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,
7/4 = 7 × 9/4 × 9 = 63/36 - Likewise, for the 2nd fraction, since 9 × 4 = 36,
21/9 = 21 × 4/9 × 4 = 84/36 - Subtract the two like fractions:
63/36 - 84/36 = 63 - 84/36 = -21/36 - After reducing the fraction, the answer is -7/12
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