Add 9/40 and 21/90
9/40 + 21/90 is 11/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
9/40 = 9 × 9/40 × 9 = 81/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
21/90 = 21 × 4/90 × 4 = 84/360 - Add the two like fractions:
81/360 + 84/360 = 81 + 84/360 = 165/360 - 165/360 simplified gives 11/24
- So, 9/40 + 21/90 = 11/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/40+21/90 9/40+42/90 9/80+21/90 27/40+21/90 9/40+63/90 45/40+21/90 63/40+21/90