Add 21/72 and 16/30
21/72 + 16/30 is 33/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 30 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 30 × 12 = 360,
16/30 = 16 × 12/30 × 12 = 192/360 - Add the two like fractions:
105/360 + 192/360 = 105 + 192/360 = 297/360 - 297/360 simplified gives 33/40
- So, 21/72 + 16/30 = 33/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72+16/30 21/72+32/30 21/72+16/60 63/72+16/30 21/72+48/30 21/72+16/90 21/72+80/30