Subtract 21/75 from 18/70
18/70 - 21/75 is -4/175.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 75 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 70 × 15 = 1050,
18/70 = 18 × 15/70 × 15 = 270/1050 - Likewise, for the 2nd fraction, since 75 × 14 = 1050,
21/75 = 21 × 14/75 × 14 = 294/1050 - Subtract the two like fractions:
270/1050 - 294/1050 = 270 - 294/1050 = -24/1050 - After reducing the fraction, the answer is -4/175
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