Add 21/40 and 20/75
21/40 + 20/75 is 19/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 75 is 600
Next, find the equivalent fraction of both fractional numbers with denominator 600 - For the 1st fraction, since 40 × 15 = 600,
21/40 = 21 × 15/40 × 15 = 315/600 - Likewise, for the 2nd fraction, since 75 × 8 = 600,
20/75 = 20 × 8/75 × 8 = 160/600 - Add the two like fractions:
315/600 + 160/600 = 315 + 160/600 = 475/600 - 475/600 simplified gives 19/24
- So, 21/40 + 20/75 = 19/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+20/75 21/40+40/75 21/80+20/75 63/40+20/75 21/40+60/75