Add 21/40 and 90/6
1st number: 21/40, 2nd number: 15 0/6
21/40 + 90/6 is 621/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 6 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 6 × 20 = 120,
90/6 = 90 × 20/6 × 20 = 1800/120 - Add the two like fractions:
63/120 + 1800/120 = 63 + 1800/120 = 1863/120 - 1863/120 simplified gives 621/40
- So, 21/40 + 90/6 = 621/40
In mixed form: 1521/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+90/6 21/80+90/6 21/40+90/12 63/40+90/6 21/40+90/18 21/40+90/30 21/40+90/42