Add 21/72 and 1/15
21/72 + 1/15 is 43/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 15 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 15 × 24 = 360,
1/15 = 1 × 24/15 × 24 = 24/360 - Add the two like fractions:
105/360 + 24/360 = 105 + 24/360 = 129/360 - 129/360 simplified gives 43/120
- So, 21/72 + 1/15 = 43/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72+1/15 21/72+2/15 21/72+1/30 63/72+1/15 21/72+3/15 21/72+1/45 21/72+5/15 21/72+1/75 21/72+7/15