Subtract 21/56 from 9/70
9/70 - 21/56 is -69/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
9/70 = 9 × 4/70 × 4 = 36/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
21/56 = 21 × 5/56 × 5 = 105/280 - Subtract the two like fractions:
36/280 - 105/280 = 36 - 105/280 = -69/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/70-21/56 9/70-42/56 27/70-21/56 9/70-63/56 45/70-21/56 63/70-21/56