Subtract 9/21 from 81/40
1st number: 2 1/40, 2nd number: 9/21
81/40 - 9/21 is 447/280.
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,
9/21 = 9 × 40/21 × 40 = 360/840 - Subtract the two like fractions:
1701/840 - 360/840 = 1701 - 360/840 = 1341/840 - After reducing the fraction, the answer is 447/280
- In mixed form: 1167/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/40-18/21 81/80-9/21 81/40-9/42 81/40-27/21 81/40-9/63 81/40-45/21 81/40-63/21