Add 30/40 and 18/5
1st number: 30/40, 2nd number: 3 3/5
30/40 + 18/5 is 87/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 5 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
30/40 = 30 × 1/40 × 1 = 30/40 - Likewise, for the 2nd fraction, since 5 × 8 = 40,
18/5 = 18 × 8/5 × 8 = 144/40 - Add the two like fractions:
30/40 + 144/40 = 30 + 144/40 = 174/40 - 174/40 simplified gives 87/20
- So, 30/40 + 18/5 = 87/20
In mixed form: 47/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/40+18/5 30/40+36/5 30/80+18/5 30/40+18/10 90/40+18/5 30/40+54/5 30/40+18/15 30/40+90/5 30/40+18/25 30/40+18/35