Add 45/20 and 72/28
1st number: 2 5/20, 2nd number: 2 16/28
45/20 + 72/28 is 135/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
45/20 = 45 × 7/20 × 7 = 315/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
72/28 = 72 × 5/28 × 5 = 360/140 - Add the two like fractions:
315/140 + 360/140 = 315 + 360/140 = 675/140 - 675/140 simplified gives 135/28
- So, 45/20 + 72/28 = 135/28
In mixed form: 423/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+72/28 45/40+72/28 45/20+72/56 45/60+72/28 45/20+72/84