Subtract 28/35 from 12/40
12/40 - 28/35 is -1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 35 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
12/40 = 12 × 7/40 × 7 = 84/280 - Likewise, for the 2nd fraction, since 35 × 8 = 280,
28/35 = 28 × 8/35 × 8 = 224/280 - Subtract the two like fractions:
84/280 - 224/280 = 84 - 224/280 = -140/280 - After reducing the fraction, the answer is -1/2
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