Add 20/72 and 4/45
20/72 + 4/45 is 11/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 45 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
20/72 = 20 × 5/72 × 5 = 100/360 - Likewise, for the 2nd fraction, since 45 × 8 = 360,
4/45 = 4 × 8/45 × 8 = 32/360 - Add the two like fractions:
100/360 + 32/360 = 100 + 32/360 = 132/360 - 132/360 simplified gives 11/30
- So, 20/72 + 4/45 = 11/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/72+4/45 20/72+8/45 20/72+4/90 60/72+4/45 20/72+12/45 20/72+20/45 20/72+28/45