Subtract 42/30 from 7/9
1st number: 7/9, 2nd number: 1 12/30
7/9 - 42/30 is -28/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,
7/9 = 7 × 10/9 × 10 = 70/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
42/30 = 42 × 3/30 × 3 = 126/90 - Subtract the two like fractions:
70/90 - 126/90 = 70 - 126/90 = -56/90 - After reducing the fraction, the answer is -28/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/9-42/30 7/9-84/30 7/18-42/30 7/9-42/60 21/9-42/30 7/27-42/30 7/9-42/90 35/9-42/30 7/45-42/30 49/9-42/30 7/63-42/30