Answers

Add 90/42 and 45/72

1^st number: 2 6/42, 2^nd number: 45/72

90/42 + 45/72 is 155/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 42 × 12 = 504,
   90/42 = 90 × 12/42 × 12 = 1080/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   45/72 = 45 × 7/72 × 7 = 315/504
4. Add the two like fractions:
   1080/504 + 315/504 = 1080 + 315/504 = 1395/504
5. 1395/504 simplified gives 155/56
6. So, 90/42 + 45/72 = 155/56
   In mixed form: 243/56

MathStep (Works offline)

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

Related: ⁹⁰/₄₂+⁹⁰/₇₂ ⁹⁰/₈₄+⁴⁵/₇₂

Add Fractions Calculator