Subtract 27/8 from 30/42
1st number: 30/42, 2nd number: 3 3/8
30/42 - 27/8 is -149/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
30/42 = 30 × 4/42 × 4 = 120/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
27/8 = 27 × 21/8 × 21 = 567/168 - Subtract the two like fractions:
120/168 - 567/168 = 120 - 567/168 = -447/168 - After reducing the fraction, the answer is -149/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42-27/8 30/42-54/8 30/84-27/8 30/42-27/16 90/42-27/8 30/42-81/8 30/42-27/24 30/42-27/40 30/42-27/56