Add 40/90 and 81/20
1st number: 40/90, 2nd number: 4 1/20
40/90 + 81/20 is 809/180.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
40/90 = 40 × 2/90 × 2 = 80/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
81/20 = 81 × 9/20 × 9 = 729/180 - Add the two like fractions:
80/180 + 729/180 = 80 + 729/180 = 809/180 - So, 40/90 + 81/20 = 809/180
In mixed form: 489/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90+81/20 40/90+81/40 40/90+81/60