Subtract 18/40 from 9/70
9/70 - 18/40 is -9/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
9/70 = 9 × 4/70 × 4 = 36/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
18/40 = 18 × 7/40 × 7 = 126/280 - Subtract the two like fractions:
36/280 - 126/280 = 36 - 126/280 = -90/280 - After reducing the fraction, the answer is -9/28
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