Subtract 21/7 from 12/24
1st number: 12/24, 2nd number: 3 0/7
12/24 - 21/7 is -5/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 7 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
12/24 = 12 × 7/24 × 7 = 84/168 - Likewise, for the 2nd fraction, since 7 × 24 = 168,
21/7 = 21 × 24/7 × 24 = 504/168 - Subtract the two like fractions:
84/168 - 504/168 = 84 - 504/168 = -420/168 - After reducing the fraction, the answer is -5/2
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