Subtract 8/40 from 12/70
12/70 - 8/40 is -1/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
12/70 = 12 × 4/70 × 4 = 48/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
8/40 = 8 × 7/40 × 7 = 56/280 - Subtract the two like fractions:
48/280 - 56/280 = 48 - 56/280 = -8/280 - After reducing the fraction, the answer is -1/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/70-8/40 12/70-16/40 12/70-8/80 36/70-8/40 12/70-24/40 60/70-8/40 84/70-8/40 12/70-56/40