Add 28/40 and 45/30
1st number: 28/40, 2nd number: 1 15/30
28/40 + 45/30 is 11/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
28/40 = 28 × 3/40 × 3 = 84/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
45/30 = 45 × 4/30 × 4 = 180/120 - Add the two like fractions:
84/120 + 180/120 = 84 + 180/120 = 264/120 - 264/120 simplified gives 11/5
- So, 28/40 + 45/30 = 11/5
In mixed form: 21/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40+45/30 28/40+90/30 28/80+45/30 28/40+45/60 84/40+45/30 28/40+45/90