Add 21/90 and 16/63
21/90 + 16/63 is 307/630.
Steps for adding 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,
16/63 = 16 × 10/63 × 10 = 160/630 - Add the two like fractions:
147/630 + 160/630 = 147 + 160/630 = 307/630 - So, 21/90 + 16/63 = 307/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+16/63 21/90+32/63 63/90+16/63 21/90+48/63 21/90+80/63