Subtract 54/49 from 81/40
1st number: 2 1/40, 2nd number: 1 5/49
81/40 - 54/49 is 1809/1960.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 49 is 1960
Next, find the equivalent fraction of both fractional numbers with denominator 1960 - For the 1st fraction, since 40 × 49 = 1960,
81/40 = 81 × 49/40 × 49 = 3969/1960 - Likewise, for the 2nd fraction, since 49 × 40 = 1960,
54/49 = 54 × 40/49 × 40 = 2160/1960 - Subtract the two like fractions:
3969/1960 - 2160/1960 = 3969 - 2160/1960 = 1809/1960
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/80-54/49 81/40-54/98