Subtract 21/10 from 42/35
1st number: 1 7/35, 2nd number: 2 1/10
42/35 - 21/10 is -9/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 10 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 35 × 2 = 70,
42/35 = 42 × 2/35 × 2 = 84/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
21/10 = 21 × 7/10 × 7 = 147/70 - Subtract the two like fractions:
84/70 - 147/70 = 84 - 147/70 = -63/70 - After reducing the fraction, the answer is -9/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/35-21/10 42/35-42/10 42/70-21/10 42/35-21/20 42/35-63/10 42/35-21/30 42/35-21/50 42/35-21/70