Add 9/8 and 21/30
1st number: 1 1/8, 2nd number: 21/30
9/8 + 21/30 is 73/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
9/8 = 9 × 15/8 × 15 = 135/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
21/30 = 21 × 4/30 × 4 = 84/120 - Add the two like fractions:
135/120 + 84/120 = 135 + 84/120 = 219/120 - 219/120 simplified gives 73/40
- So, 9/8 + 21/30 = 73/40
In mixed form: 133/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/8+21/30 9/8+42/30 9/16+21/30 9/8+21/60 27/8+21/30 9/8+63/30 9/24+21/30 9/8+21/90 45/8+21/30 9/40+21/30 63/8+21/30 9/56+21/30