Add 21/8 and 8/16
1st number: 2 5/8, 2nd number: 8/16
21/8 + 8/16 is 25/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 16 is 16
Next, find the equivalent fraction of both fractional numbers with denominator 16 - For the 1st fraction, since 8 × 2 = 16,
21/8 = 21 × 2/8 × 2 = 42/16 - Likewise, for the 2nd fraction, since 16 × 1 = 16,
8/16 = 8 × 1/16 × 1 = 8/16 - Add the two like fractions:
42/16 + 8/16 = 42 + 8/16 = 50/16 - 50/16 simplified gives 25/8
- So, 21/8 + 8/16 = 25/8
In mixed form: 31/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8+8/16 21/16+8/16 21/8+8/32 63/8+8/16 21/8+24/16 21/24+8/16 21/8+8/48 21/8+40/16 21/40+8/16 21/8+8/80 21/8+56/16 21/56+8/16