Add 42/8 and 21/10
1st number: 5 2/8, 2nd number: 2 1/10
42/8 + 21/10 is 147/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 10 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 8 × 5 = 40,
42/8 = 42 × 5/8 × 5 = 210/40 - Likewise, for the 2nd fraction, since 10 × 4 = 40,
21/10 = 21 × 4/10 × 4 = 84/40 - Add the two like fractions:
210/40 + 84/40 = 210 + 84/40 = 294/40 - 294/40 simplified gives 147/20
- So, 42/8 + 21/10 = 147/20
In mixed form: 77/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8+21/10 42/8+42/10 42/16+21/10 42/8+21/20 42/8+63/10 42/24+21/10 42/8+21/30 42/40+21/10 42/8+21/50 42/56+21/10 42/8+21/70