Subtract 96/30 from 81/42
1st number: 1 39/42, 2nd number: 3 6/30
81/42 - 96/30 is -89/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
81/42 = 81 × 5/42 × 5 = 405/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
96/30 = 96 × 7/30 × 7 = 672/210 - Subtract the two like fractions:
405/210 - 672/210 = 405 - 672/210 = -267/210 - After reducing the fraction, the answer is -89/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84-96/30 81/42-96/60 81/42-96/90