Subtract 15/90 from 3/70
3/70 - 15/90 is -13/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
3/70 = 3 × 9/70 × 9 = 27/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
15/90 = 15 × 7/90 × 7 = 105/630 - Subtract the two like fractions:
27/630 - 105/630 = 27 - 105/630 = -78/630 - After reducing the fraction, the answer is -13/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/70-15/90 3/70-30/90 9/70-15/90 3/70-45/90 15/70-15/90 3/70-75/90 21/70-15/90