Add 72/20 and 18/40
1st number: 3 12/20, 2nd number: 18/40
72/20 + 18/40 is 81/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
72/20 = 72 × 2/20 × 2 = 144/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
18/40 = 18 × 1/40 × 1 = 18/40 - Add the two like fractions:
144/40 + 18/40 = 144 + 18/40 = 162/40 - 162/40 simplified gives 81/20
- So, 72/20 + 18/40 = 81/20
In mixed form: 41/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20+36/40 72/40+18/40 72/20+18/80 72/20+54/40 72/60+18/40 72/20+90/40