Add 8/10 and 21/40
8/10 + 21/40 is 53/40.
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,
8/10 = 8 × 4/10 × 4 = 32/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
21/40 = 21 × 1/40 × 1 = 21/40 - Add the two like fractions:
32/40 + 21/40 = 32 + 21/40 = 53/40 - So, 8/10 + 21/40 = 53/40
In mixed form: 113/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/10+21/40 8/10+42/40 8/20+21/40 8/10+21/80 24/10+21/40 8/10+63/40 8/30+21/40 40/10+21/40 8/50+21/40 56/10+21/40 8/70+21/40