Subtract 30/21 from 3/8
1st number: 3/8, 2nd number: 1 9/21
3/8 - 30/21 is -59/56.
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,
3/8 = 3 × 21/8 × 21 = 63/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
30/21 = 30 × 8/21 × 8 = 240/168 - Subtract the two like fractions:
63/168 - 240/168 = 63 - 240/168 = -177/168 - After reducing the fraction, the answer is -59/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/8-30/21 3/8-60/21 3/16-30/21 3/8-30/42 9/8-30/21 3/8-90/21 3/24-30/21 3/8-30/63 15/8-30/21 3/40-30/21 21/8-30/21 3/56-30/21