Add 1/72 and 20/90
1/72 + 20/90 is 17/72.
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,
1/72 = 1 × 5/72 × 5 = 5/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
20/90 = 20 × 4/90 × 4 = 80/360 - Add the two like fractions:
5/360 + 80/360 = 5 + 80/360 = 85/360 - 85/360 simplified gives 17/72
- So, 1/72 + 20/90 = 17/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/72+20/90 1/72+40/90 3/72+20/90 1/72+60/90 5/72+20/90 7/72+20/90