Subtract 2/63 from 21/90
21/90 - 2/63 is 127/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 63 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
2/63 = 2 × 10/63 × 10 = 20/630 - Subtract the two like fractions:
147/630 - 20/630 = 147 - 20/630 = 127/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90-2/63 21/90-4/63 63/90-2/63 21/90-6/63 21/90-10/63 21/90-14/63