Subtract 25/70 from 3/18
3/18 - 25/70 is -4/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
3/18 = 3 × 35/18 × 35 = 105/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
25/70 = 25 × 9/70 × 9 = 225/630 - Subtract the two like fractions:
105/630 - 225/630 = 105 - 225/630 = -120/630 - After reducing the fraction, the answer is -4/21
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