Add 45/40 and 21/72
1st number: 1 5/40, 2nd number: 21/72
45/40 + 21/72 is 17/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
45/40 = 45 × 9/40 × 9 = 405/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
21/72 = 21 × 5/72 × 5 = 105/360 - Add the two like fractions:
405/360 + 105/360 = 405 + 105/360 = 510/360 - 510/360 simplified gives 17/12
- So, 45/40 + 21/72 = 17/12
In mixed form: 15/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40+21/72 45/40+42/72 45/80+21/72 45/40+63/72