Add 21/90 and 20/98
21/90 + 20/98 is 643/1470.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 98 is 4410
Next, find the equivalent fraction of both fractional numbers with denominator 4410 - For the 1st fraction, since 90 × 49 = 4410,
21/90 = 21 × 49/90 × 49 = 1029/4410 - Likewise, for the 2nd fraction, since 98 × 45 = 4410,
20/98 = 20 × 45/98 × 45 = 900/4410 - Add the two like fractions:
1029/4410 + 900/4410 = 1029 + 900/4410 = 1929/4410 - 1929/4410 simplified gives 643/1470
- So, 21/90 + 20/98 = 643/1470
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+20/98 21/90+40/98 63/90+20/98 21/90+60/98