Add 18/90 and 9/8
1st number: 18/90, 2nd number: 1 1/8
18/90 + 9/8 is 53/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
18/90 = 18 × 4/90 × 4 = 72/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
9/8 = 9 × 45/8 × 45 = 405/360 - Add the two like fractions:
72/360 + 405/360 = 72 + 405/360 = 477/360 - 477/360 simplified gives 53/40
- So, 18/90 + 9/8 = 53/40
In mixed form: 113/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/90+9/8 18/90+18/8 18/90+9/16 54/90+9/8 18/90+27/8 18/90+9/24 18/90+45/8 18/90+9/40 18/90+63/8 18/90+9/56