Subtract 25/70 from 3/18, Solve 3/18

Subtract 25/70 from 3/18

3/18 - 25/70 is -4/21.

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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