Add 21/10 and 28/12
1st number: 2 1/10, 2nd number: 2 4/12
21/10 + 28/12 is 133/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 10 × 6 = 60,
21/10 = 21 × 6/10 × 6 = 126/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
28/12 = 28 × 5/12 × 5 = 140/60 - Add the two like fractions:
126/60 + 140/60 = 126 + 140/60 = 266/60 - 266/60 simplified gives 133/30
- So, 21/10 + 28/12 = 133/30
In mixed form: 413/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+28/12 21/10+56/12 21/20+28/12 21/10+28/24 63/10+28/12 21/10+84/12 21/30+28/12 21/10+28/36 21/50+28/12 21/10+28/60 21/70+28/12 21/10+28/84