Subtract 21/42 from 8/35
8/35 - 21/42 is -19/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 35 × 6 = 210,
8/35 = 8 × 6/35 × 6 = 48/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Subtract the two like fractions:
48/210 - 105/210 = 48 - 105/210 = -57/210 - After reducing the fraction, the answer is -19/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/35-21/42 8/70-21/42 8/35-21/84 24/35-21/42 8/35-63/42 40/35-21/42 56/35-21/42