Subtract 18/35 from 81/72
1st number: 1 9/72, 2nd number: 18/35
81/72 - 18/35 is 171/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 35 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 72 × 35 = 2520,
81/72 = 81 × 35/72 × 35 = 2835/2520 - Likewise, for the 2nd fraction, since 35 × 72 = 2520,
18/35 = 18 × 72/35 × 72 = 1296/2520 - Subtract the two like fractions:
2835/2520 - 1296/2520 = 2835 - 1296/2520 = 1539/2520 - After reducing the fraction, the answer is 171/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/72-36/35 81/72-18/70 81/72-54/35 81/72-90/35