Add 21/16 and 28/63
1st number: 1 5/16, 2nd number: 28/63
21/16 + 28/63 is 253/144.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 63 is 1008
Next, find the equivalent fraction of both fractional numbers with denominator 1008 - For the 1st fraction, since 16 × 63 = 1008,
21/16 = 21 × 63/16 × 63 = 1323/1008 - Likewise, for the 2nd fraction, since 63 × 16 = 1008,
28/63 = 28 × 16/63 × 16 = 448/1008 - Add the two like fractions:
1323/1008 + 448/1008 = 1323 + 448/1008 = 1771/1008 - 1771/1008 simplified gives 253/144
- So, 21/16 + 28/63 = 253/144
In mixed form: 1109/144
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/16+28/63 21/16+56/63 21/32+28/63 63/16+28/63 21/16+84/63 21/48+28/63 21/80+28/63