Subtract 28/70 from 12/18
12/18 - 28/70 is 4/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
12/18 = 12 × 35/18 × 35 = 420/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
28/70 = 28 × 9/70 × 9 = 252/630 - Subtract the two like fractions:
420/630 - 252/630 = 420 - 252/630 = 168/630 - After reducing the fraction, the answer is 4/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/18-28/70 12/18-56/70 12/36-28/70 36/18-28/70 12/18-84/70 12/54-28/70 60/18-28/70 12/90-28/70 84/18-28/70