Subtract 3/21 from 81/40
1st number: 2 1/40, 2nd number: 3/21
81/40 - 3/21 is 527/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
81/40 = 81 × 21/40 × 21 = 1701/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
3/21 = 3 × 40/21 × 40 = 120/840 - Subtract the two like fractions:
1701/840 - 120/840 = 1701 - 120/840 = 1581/840 - After reducing the fraction, the answer is 527/280
- In mixed form: 1247/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/40-6/21 81/80-3/21 81/40-3/42 81/40-9/21 81/40-3/63 81/40-15/21