Subtract 18/21 from 8/5
1st number: 1 3/5, 2nd number: 18/21
8/5 - 18/21 is 26/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
8/5 = 8 × 21/5 × 21 = 168/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
18/21 = 18 × 5/21 × 5 = 90/105 - Subtract the two like fractions:
168/105 - 90/105 = 168 - 90/105 = 78/105 - After reducing the fraction, the answer is 26/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/5-18/21 8/5-36/21 8/10-18/21 8/5-18/42 24/5-18/21 8/5-54/21 8/15-18/21 8/5-18/63 40/5-18/21 8/5-90/21 8/25-18/21 56/5-18/21 8/35-18/21