Subtract 49/70 from 4/42
4/42 - 49/70 is -127/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
4/42 = 4 × 5/42 × 5 = 20/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
49/70 = 49 × 3/70 × 3 = 147/210 - Subtract the two like fractions:
20/210 - 147/210 = 20 - 147/210 = -127/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42-49/70 4/42-98/70 4/84-49/70 12/42-49/70 20/42-49/70 28/42-49/70