Answers

Add 90/40 and 81/72

1^st number: 2 10/40, 2^nd number: 1 9/72

90/40 + 81/72 is 27/8.

Steps for adding fractions

1. 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
2. For the 1st fraction, since 40 × 9 = 360,
   90/40 = 90 × 9/40 × 9 = 810/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   81/72 = 81 × 5/72 × 5 = 405/360
4. Add the two like fractions:
   810/360 + 405/360 = 810 + 405/360 = 1215/360
5. 1215/360 simplified gives 27/8
6. So, 90/40 + 81/72 = 27/8
   In mixed form: 33/8

MathStep (Works offline)

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

Related: ⁹⁰/₈₀+⁸¹/₇₂

Add Fractions Calculator