Subtract 1/21 from 7/5
1st number: 1 2/5, 2nd number: 1/21
7/5 - 1/21 is 142/105.
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,
7/5 = 7 × 21/5 × 21 = 147/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
1/21 = 1 × 5/21 × 5 = 5/105 - Subtract the two like fractions:
147/105 - 5/105 = 147 - 5/105 = 142/105 - In mixed form: 137/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/5-1/21 7/5-2/21 7/10-1/21 7/5-1/42 21/5-1/21 7/5-3/21 7/15-1/21 7/5-1/63 35/5-1/21 7/5-5/21 7/25-1/21 49/5-1/21 7/5-7/21 7/35-1/21