Add 3/10 and 21/80
3/10 + 21/80 is 9/16.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 10 × 8 = 80,
3/10 = 3 × 8/10 × 8 = 24/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
21/80 = 21 × 1/80 × 1 = 21/80 - Add the two like fractions:
24/80 + 21/80 = 24 + 21/80 = 45/80 - 45/80 simplified gives 9/16
- So, 3/10 + 21/80 = 9/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/10+21/80 3/10+42/80 3/20+21/80 9/10+21/80 3/10+63/80 3/30+21/80 15/10+21/80 3/50+21/80 21/10+21/80 3/70+21/80