Add 15/16 and 8/21
15/16 + 8/21 is 443/336.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 21 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 16 × 21 = 336,
15/16 = 15 × 21/16 × 21 = 315/336 - Likewise, for the 2nd fraction, since 21 × 16 = 336,
8/21 = 8 × 16/21 × 16 = 128/336 - Add the two like fractions:
315/336 + 128/336 = 315 + 128/336 = 443/336 - So, 15/16 + 8/21 = 443/336
In mixed form: 1107/336
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/16+8/21 15/16+16/21 15/32+8/21 15/16+8/42 45/16+8/21 15/16+24/21 15/48+8/21 15/16+8/63 75/16+8/21 15/16+40/21 15/80+8/21 15/16+56/21