Add 21/72 and 3/20
21/72 + 3/20 is 53/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 20 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
21/72 = 21 × 5/72 × 5 = 105/360 - Likewise, for the 2nd fraction, since 20 × 18 = 360,
3/20 = 3 × 18/20 × 18 = 54/360 - Add the two like fractions:
105/360 + 54/360 = 105 + 54/360 = 159/360 - 159/360 simplified gives 53/120
- So, 21/72 + 3/20 = 53/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72+3/20 21/72+6/20 21/72+3/40 63/72+3/20 21/72+9/20 21/72+3/60 21/72+15/20 21/72+21/20