Add 7/40 and 21/98
7/40 + 21/98 is 109/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 98 is 1960
Next, find the equivalent fraction of both fractional numbers with denominator 1960 - For the 1st fraction, since 40 × 49 = 1960,
7/40 = 7 × 49/40 × 49 = 343/1960 - Likewise, for the 2nd fraction, since 98 × 20 = 1960,
21/98 = 21 × 20/98 × 20 = 420/1960 - Add the two like fractions:
343/1960 + 420/1960 = 343 + 420/1960 = 763/1960 - 763/1960 simplified gives 109/280
- So, 7/40 + 21/98 = 109/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/40+21/98 7/40+42/98 7/80+21/98 21/40+21/98 7/40+63/98 35/40+21/98 49/40+21/98