Add 21/10 and 20/8
1st number: 2 1/10, 2nd number: 2 4/8
21/10 + 20/8 is 23/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 10 × 4 = 40,
21/10 = 21 × 4/10 × 4 = 84/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
20/8 = 20 × 5/8 × 5 = 100/40 - Add the two like fractions:
84/40 + 100/40 = 84 + 100/40 = 184/40 - 184/40 simplified gives 23/5
- So, 21/10 + 20/8 = 23/5
In mixed form: 43/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+20/8 21/10+40/8 21/20+20/8 21/10+20/16 63/10+20/8 21/10+60/8 21/30+20/8 21/10+20/24 21/50+20/8 21/10+20/40 21/70+20/8 21/10+20/56