Subtract 30/7 from 45/12
1st number: 3 9/12, 2nd number: 4 2/7
45/12 - 30/7 is -15/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
45/12 = 45 × 7/12 × 7 = 315/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
30/7 = 30 × 12/7 × 12 = 360/84 - Subtract the two like fractions:
315/84 - 360/84 = 315 - 360/84 = -45/84 - After reducing the fraction, the answer is -15/28
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