Add 21/5 and 12/8
1st number: 4 1/5, 2nd number: 1 4/8
21/5 + 12/8 is 57/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
21/5 = 21 × 8/5 × 8 = 168/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
12/8 = 12 × 5/8 × 5 = 60/40 - Add the two like fractions:
168/40 + 60/40 = 168 + 60/40 = 228/40 - 228/40 simplified gives 57/10
- So, 21/5 + 12/8 = 57/10
In mixed form: 57/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+12/8 21/5+24/8 21/10+12/8 21/5+12/16 63/5+12/8 21/5+36/8 21/15+12/8 21/5+12/24 21/5+60/8 21/25+12/8 21/5+12/40 21/5+84/8 21/35+12/8 21/5+12/56