Add 72/40 and 9/20
1st number: 1 32/40, 2nd number: 9/20
72/40 + 9/20 is 9/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 20 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
72/40 = 72 × 1/40 × 1 = 72/40 - Likewise, for the 2nd fraction, since 20 × 2 = 40,
9/20 = 9 × 2/20 × 2 = 18/40 - Add the two like fractions:
72/40 + 18/40 = 72 + 18/40 = 90/40 - 90/40 simplified gives 9/4
- So, 72/40 + 9/20 = 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: 72/40+18/20 72/80+9/20 72/40+9/40 72/40+27/20 72/40+9/60 72/40+45/20 72/40+63/20