Subtract 30/8 from 4/21
1st number: 4/21, 2nd number: 3 6/8
4/21 - 30/8 is -299/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
4/21 = 4 × 8/21 × 8 = 32/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
30/8 = 30 × 21/8 × 21 = 630/168 - Subtract the two like fractions:
32/168 - 630/168 = 32 - 630/168 = -598/168 - After reducing the fraction, the answer is -299/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-30/8 4/21-60/8 4/42-30/8 4/21-30/16 12/21-30/8 4/21-90/8 4/63-30/8 4/21-30/24 20/21-30/8 4/21-30/40 28/21-30/8 4/21-30/56