Subtract 40/70 from 8/30
8/30 - 40/70 is -32/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
8/30 = 8 × 7/30 × 7 = 56/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
40/70 = 40 × 3/70 × 3 = 120/210 - Subtract the two like fractions:
56/210 - 120/210 = 56 - 120/210 = -64/210 - After reducing the fraction, the answer is -32/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/30-40/70 8/30-80/70 8/60-40/70 24/30-40/70 8/90-40/70 40/30-40/70 56/30-40/70