Subtract 50/90 from 20/70
20/70 - 50/90 is -17/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
20/70 = 20 × 9/70 × 9 = 180/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
50/90 = 50 × 7/90 × 7 = 350/630 - Subtract the two like fractions:
180/630 - 350/630 = 180 - 350/630 = -170/630 - After reducing the fraction, the answer is -17/63
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