Add 30/40 and 45/30
1st number: 30/40, 2nd number: 1 15/30
30/40 + 45/30 is 9/4.
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,
30/40 = 30 × 3/40 × 3 = 90/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
45/30 = 45 × 4/30 × 4 = 180/120 - Add the two like fractions:
90/120 + 180/120 = 90 + 180/120 = 270/120 - 270/120 simplified gives 9/4
- So, 30/40 + 45/30 = 9/4
In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/40+45/30 30/40+90/30 30/80+45/30 30/40+45/60 90/40+45/30 30/40+45/90