Answers

Add 72/20 and 98/90

1^st number: 3 12/20, 2^nd number: 1 8/90

72/20 + 98/90 is 211/45.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 90 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 20 × 9 = 180,
   72/20 = 72 × 9/20 × 9 = 648/180
3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
   98/90 = 98 × 2/90 × 2 = 196/180
4. Add the two like fractions:
   648/180 + 196/180 = 648 + 196/180 = 844/180
5. 844/180 simplified gives 211/45
6. So, 72/20 + 98/90 = 211/45
   In mixed form: 431/45

MathStep (Works offline)

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

Related: ⁷²/₄₀+⁹⁸/₉₀ ⁷²/₆₀+⁹⁸/₉₀

Add Fractions Calculator