Subtract 3/8 from 54/21
1st number: 2 12/21, 2nd number: 3/8
54/21 - 3/8 is 123/56.
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,
54/21 = 54 × 8/21 × 8 = 432/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
3/8 = 3 × 21/8 × 21 = 63/168 - Subtract the two like fractions:
432/168 - 63/168 = 432 - 63/168 = 369/168 - After reducing the fraction, the answer is 123/56
- In mixed form: 211/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21-6/8 54/42-3/8 54/21-3/16 54/21-9/8 54/63-3/8 54/21-3/24 54/21-15/8 54/21-3/40 54/21-21/8 54/21-3/56