Subtract 30/21 from 2/8
1st number: 2/8, 2nd number: 1 9/21
2/8 - 30/21 is -33/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
2/8 = 2 × 21/8 × 21 = 42/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
30/21 = 30 × 8/21 × 8 = 240/168 - Subtract the two like fractions:
42/168 - 240/168 = 42 - 240/168 = -198/168 - After reducing the fraction, the answer is -33/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/8-30/21 2/8-60/21 2/16-30/21 2/8-30/42 6/8-30/21 2/8-90/21 2/24-30/21 2/8-30/63 10/8-30/21 2/40-30/21 14/8-30/21 2/56-30/21