Add 42/20 and 56/21
1st number: 2 2/20, 2nd number: 2 14/21
42/20 + 56/21 is 143/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
42/20 = 42 × 21/20 × 21 = 882/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
56/21 = 56 × 20/21 × 20 = 1120/420 - Add the two like fractions:
882/420 + 1120/420 = 882 + 1120/420 = 2002/420 - 2002/420 simplified gives 143/30
- So, 42/20 + 56/21 = 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: 84/20+56/21 42/40+56/21 42/20+56/42 42/60+56/21 42/20+56/63