Subtract 21/30 from 42/9
1st number: 4 6/9, 2nd number: 21/30
42/9 - 21/30 is 119/30.
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,
42/9 = 42 × 10/9 × 10 = 420/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Subtract the two like fractions:
420/90 - 63/90 = 420 - 63/90 = 357/90 - After reducing the fraction, the answer is 119/30
- In mixed form: 329/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/9-21/30 42/9-42/30 42/18-21/30 42/9-21/60 42/9-63/30 42/27-21/30 42/9-21/90 42/45-21/30 42/63-21/30