Subtract 21/30 from 8/70
8/70 - 21/30 is -41/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 30 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 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Subtract the two like fractions:
24/210 - 147/210 = 24 - 147/210 = -123/210 - After reducing the fraction, the answer is -41/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/70-21/30 8/70-42/30 8/70-21/60 24/70-21/30 8/70-63/30 8/70-21/90 40/70-21/30 56/70-21/30