Subtract 70/90 from 12/35
12/35 - 70/90 is -137/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 35 × 18 = 630,
12/35 = 12 × 18/35 × 18 = 216/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
70/90 = 70 × 7/90 × 7 = 490/630 - Subtract the two like fractions:
216/630 - 490/630 = 216 - 490/630 = -274/630 - After reducing the fraction, the answer is -137/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/35-70/90 12/70-70/90 36/35-70/90 60/35-70/90 84/35-70/90