Add 21/24 and 9/90
21/24 + 9/90 is 39/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 24 × 15 = 360,
21/24 = 21 × 15/24 × 15 = 315/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
9/90 = 9 × 4/90 × 4 = 36/360 - Add the two like fractions:
315/360 + 36/360 = 315 + 36/360 = 351/360 - 351/360 simplified gives 39/40
- So, 21/24 + 9/90 = 39/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24+9/90 21/24+18/90 21/48+9/90 63/24+9/90 21/24+27/90 21/72+9/90 21/24+45/90 21/24+63/90