Add 72/28 and 15/40
1st number: 2 16/28, 2nd number: 15/40
72/28 + 15/40 is 165/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 28 × 10 = 280,
72/28 = 72 × 10/28 × 10 = 720/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
15/40 = 15 × 7/40 × 7 = 105/280 - Add the two like fractions:
720/280 + 105/280 = 720 + 105/280 = 825/280 - 825/280 simplified gives 165/56
- So, 72/28 + 15/40 = 165/56
In mixed form: 253/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/28+30/40 72/56+15/40 72/28+15/80 72/28+45/40 72/84+15/40 72/28+75/40