Answers

Add 21/98 and 90/20

1^st number: 21/98, 2^nd number: 4 10/20

21/98 + 90/20 is 33/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 98 and 20 is 980
   
   Next, find the equivalent fraction of both fractional numbers with denominator 980
2. For the 1st fraction, since 98 × 10 = 980,
   21/98 = 21 × 10/98 × 10 = 210/980
3. Likewise, for the 2nd fraction, since 20 × 49 = 980,
   90/20 = 90 × 49/20 × 49 = 4410/980
4. Add the two like fractions:
   210/980 + 4410/980 = 210 + 4410/980 = 4620/980
5. 4620/980 simplified gives 33/7
6. So, 21/98 + 90/20 = 33/7
   In mixed form: 45/7

MathStep (Works offline)

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

Related: ⁴²/₉₈+⁹⁰/₂₀ ²¹/₉₈+⁹⁰/₄₀ ⁶³/₉₈+⁹⁰/₂₀ ²¹/₉₈+⁹⁰/₆₀

Add Fractions Calculator