Subtract 20/30 from 18/35, Solve 18/35

Subtract 20/30 from 18/35

18/35 - 20/30 is -16/105.

Find the least common denominator or LCM of the two denominators:
LCM of 35 and 30 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 35 × 6 = 210,
18/35 = 18 × 6/35 × 6 = 108/210
Likewise, for the 2nd fraction, since 30 × 7 = 210,
20/30 = 20 × 7/30 × 7 = 140/210
Subtract the two like fractions:
108/210 - 140/210 = 108 - 140/210 = -32/210
After reducing the fraction, the answer is -16/105

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