Subtract 18/4 from 15/70
1st number: 15/70, 2nd number: 4 2/4
15/70 - 18/4 is -30/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 4 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
15/70 = 15 × 2/70 × 2 = 30/140 - Likewise, for the 2nd fraction, since 4 × 35 = 140,
18/4 = 18 × 35/4 × 35 = 630/140 - Subtract the two like fractions:
30/140 - 630/140 = 30 - 630/140 = -600/140 - After reducing the fraction, the answer is -30/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70-18/4 15/70-36/4 15/70-18/8 45/70-18/4 15/70-54/4 15/70-18/12 75/70-18/4 15/70-90/4 15/70-18/20 15/70-18/28