Add 72/18 and 5/40
1st number: 4 0/18, 2nd number: 5/40
72/18 + 5/40 is 33/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
72/18 = 72 × 20/18 × 20 = 1440/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
5/40 = 5 × 9/40 × 9 = 45/360 - Add the two like fractions:
1440/360 + 45/360 = 1440 + 45/360 = 1485/360 - 1485/360 simplified gives 33/8
- So, 72/18 + 5/40 = 33/8
In mixed form: 41/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/18+10/40 72/36+5/40 72/18+5/80 72/18+15/40 72/54+5/40 72/18+25/40 72/90+5/40 72/18+35/40