Add 18/72 and 8/40
18/72 + 8/40 is 9/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
18/72 = 18 × 5/72 × 5 = 90/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
8/40 = 8 × 9/40 × 9 = 72/360 - Add the two like fractions:
90/360 + 72/360 = 90 + 72/360 = 162/360 - 162/360 simplified gives 9/20
- So, 18/72 + 8/40 = 9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/72+8/40 18/72+16/40 18/72+8/80 54/72+8/40 18/72+24/40 90/72+8/40 18/72+56/40