Add 72/18 and 8/40
1st number: 4 0/18, 2nd number: 8/40
72/18 + 8/40 is 21/5.
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,
8/40 = 8 × 9/40 × 9 = 72/360 - Add the two like fractions:
1440/360 + 72/360 = 1440 + 72/360 = 1512/360 - 1512/360 simplified gives 21/5
- So, 72/18 + 8/40 = 21/5
In mixed form: 41/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/18+16/40 72/36+8/40 72/18+8/80 72/18+24/40 72/54+8/40 72/90+8/40 72/18+56/40