Subtract 36/12 from 70/90
1st number: 70/90, 2nd number: 3 0/12
70/90 - 36/12 is -20/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
70/90 = 70 × 2/90 × 2 = 140/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
36/12 = 36 × 15/12 × 15 = 540/180 - Subtract the two like fractions:
140/180 - 540/180 = 140 - 540/180 = -400/180 - After reducing the fraction, the answer is -20/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90-72/12 70/90-36/24 70/90-36/60 70/90-36/84