Add 9/72 and 8/20
9/72 + 8/20 is 21/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 20 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
9/72 = 9 × 5/72 × 5 = 45/360 - Likewise, for the 2nd fraction, since 20 × 18 = 360,
8/20 = 8 × 18/20 × 18 = 144/360 - Add the two like fractions:
45/360 + 144/360 = 45 + 144/360 = 189/360 - 189/360 simplified gives 21/40
- So, 9/72 + 8/20 = 21/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/72+8/20 9/72+16/20 9/72+8/40 27/72+8/20 9/72+24/20 9/72+8/60 45/72+8/20 9/72+40/20 63/72+8/20 9/72+56/20