Add 21/49 and 72/20
1st number: 21/49, 2nd number: 3 12/20
21/49 + 72/20 is 141/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 20 is 980
Next, find the equivalent fraction of both fractional numbers with denominator 980 - For the 1st fraction, since 49 × 20 = 980,
21/49 = 21 × 20/49 × 20 = 420/980 - Likewise, for the 2nd fraction, since 20 × 49 = 980,
72/20 = 72 × 49/20 × 49 = 3528/980 - Add the two like fractions:
420/980 + 3528/980 = 420 + 3528/980 = 3948/980 - 3948/980 simplified gives 141/35
- So, 21/49 + 72/20 = 141/35
In mixed form: 41/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/49+72/20 21/98+72/20 21/49+72/40 63/49+72/20 21/49+72/60