Subtract 30/21 from 7/35
1st number: 7/35, 2nd number: 1 9/21
7/35 - 30/21 is -43/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 35 × 3 = 105,
7/35 = 7 × 3/35 × 3 = 21/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
30/21 = 30 × 5/21 × 5 = 150/105 - Subtract the two like fractions:
21/105 - 150/105 = 21 - 150/105 = -129/105 - After reducing the fraction, the answer is -43/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/35-30/21 7/35-60/21 7/70-30/21 7/35-30/42 21/35-30/21 7/35-90/21 7/35-30/63 49/35-30/21