Subtract 84/30 from 28/70
1st number: 28/70, 2nd number: 2 24/30
28/70 - 84/30 is -12/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
28/70 = 28 × 3/70 × 3 = 84/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
84/30 = 84 × 7/30 × 7 = 588/210 - Subtract the two like fractions:
84/210 - 588/210 = 84 - 588/210 = -504/210 - After reducing the fraction, the answer is -12/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/70-84/30 28/70-84/60 84/70-84/30 28/70-84/90