Add 21/72 and 35/90
21/72 + 35/90 is 49/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 90 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 90 × 4 = 360,
35/90 = 35 × 4/90 × 4 = 140/360 - Add the two like fractions:
105/360 + 140/360 = 105 + 140/360 = 245/360 - 245/360 simplified gives 49/72
- So, 21/72 + 35/90 = 49/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72+35/90 21/72+70/90 63/72+35/90