Subtract 12/40 from 18/70
18/70 - 12/40 is -3/70.
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,
18/70 = 18 × 4/70 × 4 = 72/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
12/40 = 12 × 7/40 × 7 = 84/280 - Subtract the two like fractions:
72/280 - 84/280 = 72 - 84/280 = -12/280 - After reducing the fraction, the answer is -3/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/70-12/40 18/70-24/40 18/70-12/80 54/70-12/40 18/70-36/40 90/70-12/40 18/70-60/40 18/70-84/40