Subtract 20/35 from 30/90
30/90 - 20/35 is -5/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 35 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
30/90 = 30 × 7/90 × 7 = 210/630 - Likewise, for the 2nd fraction, since 35 × 18 = 630,
20/35 = 20 × 18/35 × 18 = 360/630 - Subtract the two like fractions:
210/630 - 360/630 = 210 - 360/630 = -150/630 - After reducing the fraction, the answer is -5/21
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