Subtract 7/42 from 8/70
8/70 - 7/42 is -11/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
8/70 = 8 × 3/70 × 3 = 24/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
7/42 = 7 × 5/42 × 5 = 35/210 - Subtract the two like fractions:
24/210 - 35/210 = 24 - 35/210 = -11/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/70-7/42 8/70-14/42 8/70-7/84 24/70-7/42 8/70-21/42 40/70-7/42 8/70-35/42 56/70-7/42 8/70-49/42