Subtract 42/54 from 9/30
9/30 - 42/54 is -43/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 30 × 9 = 270,
9/30 = 9 × 9/30 × 9 = 81/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
42/54 = 42 × 5/54 × 5 = 210/270 - Subtract the two like fractions:
81/270 - 210/270 = 81 - 210/270 = -129/270 - After reducing the fraction, the answer is -43/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/30-42/54 9/30-84/54 9/60-42/54 27/30-42/54 9/90-42/54 45/30-42/54 63/30-42/54