Add 28/10 and 21/40
1st number: 2 8/10, 2nd number: 21/40
28/10 + 21/40 is 133/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 10 × 4 = 40,
28/10 = 28 × 4/10 × 4 = 112/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
21/40 = 21 × 1/40 × 1 = 21/40 - Add the two like fractions:
112/40 + 21/40 = 112 + 21/40 = 133/40 - So, 28/10 + 21/40 = 133/40
In mixed form: 313/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/10+21/40 28/10+42/40 28/20+21/40 28/10+21/80 84/10+21/40 28/10+63/40 28/30+21/40 28/50+21/40 28/70+21/40