Answers

Add 28/90 and 90/72

1^st number: 28/90, 2^nd number: 1 18/72

28/90 + 90/72 is 281/180.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 90 × 4 = 360,
   28/90 = 28 × 4/90 × 4 = 112/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   90/72 = 90 × 5/72 × 5 = 450/360
4. Add the two like fractions:
   112/360 + 450/360 = 112 + 450/360 = 562/360
5. 562/360 simplified gives 281/180
6. So, 28/90 + 90/72 = 281/180
   In mixed form: 1101/180

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁵⁶/₉₀+⁹⁰/₇₂ ⁸⁴/₉₀+⁹⁰/₇₂

Add Fractions Calculator