Add 21/40 and 90/24
1st number: 21/40, 2nd number: 3 18/24
21/40 + 90/24 is 171/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 24 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Likewise, for the 2nd fraction, since 24 × 5 = 120,
90/24 = 90 × 5/24 × 5 = 450/120 - Add the two like fractions:
63/120 + 450/120 = 63 + 450/120 = 513/120 - 513/120 simplified gives 171/40
- So, 21/40 + 90/24 = 171/40
In mixed form: 411/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+90/24 21/80+90/24 21/40+90/48 63/40+90/24 21/40+90/72