Subtract 28/63 from 3/30
3/30 - 28/63 is -31/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 63 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 30 × 21 = 630,
3/30 = 3 × 21/30 × 21 = 63/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
28/63 = 28 × 10/63 × 10 = 280/630 - Subtract the two like fractions:
63/630 - 280/630 = 63 - 280/630 = -217/630 - After reducing the fraction, the answer is -31/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/30-28/63 3/30-56/63 3/60-28/63 9/30-28/63 3/30-84/63 3/90-28/63 15/30-28/63 21/30-28/63