Add 49/42 and 72/20
1st number: 1 7/42, 2nd number: 3 12/20
49/42 + 72/20 is 143/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
49/42 = 49 × 10/42 × 10 = 490/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
72/20 = 72 × 21/20 × 21 = 1512/420 - Add the two like fractions:
490/420 + 1512/420 = 490 + 1512/420 = 2002/420 - 2002/420 simplified gives 143/30
- So, 49/42 + 72/20 = 143/30
In mixed form: 423/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/42+72/20 49/84+72/20 49/42+72/40 49/42+72/60