Add 21/40 and 6/15
21/40 + 6/15 is 37/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 15 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 15 × 8 = 120,
6/15 = 6 × 8/15 × 8 = 48/120 - Add the two like fractions:
63/120 + 48/120 = 63 + 48/120 = 111/120 - 111/120 simplified gives 37/40
- So, 21/40 + 6/15 = 37/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+6/15 21/40+12/15 21/80+6/15 21/40+6/30 63/40+6/15 21/40+18/15 21/40+6/45 21/40+30/15 21/40+6/75 21/40+42/15