Add 9/30 and 21/40
9/30 + 21/40 is 33/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
9/30 = 9 × 4/30 × 4 = 36/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Add the two like fractions:
36/120 + 63/120 = 36 + 63/120 = 99/120 - 99/120 simplified gives 33/40
- So, 9/30 + 21/40 = 33/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/30+21/40 9/30+42/40 9/60+21/40 9/30+21/80 27/30+21/40 9/30+63/40 9/90+21/40 45/30+21/40 63/30+21/40