Subtract 15/40 from 7/70
7/70 - 15/40 is -11/40.
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,
7/70 = 7 × 4/70 × 4 = 28/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
15/40 = 15 × 7/40 × 7 = 105/280 - Subtract the two like fractions:
28/280 - 105/280 = 28 - 105/280 = -77/280 - After reducing the fraction, the answer is -11/40
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