Add 72/20 and 50/42
1st number: 3 12/20, 2nd number: 1 8/42
72/20 + 50/42 is 503/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
72/20 = 72 × 21/20 × 21 = 1512/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
50/42 = 50 × 10/42 × 10 = 500/420 - Add the two like fractions:
1512/420 + 500/420 = 1512 + 500/420 = 2012/420 - 2012/420 simplified gives 503/105
- So, 72/20 + 50/42 = 503/105
In mixed form: 483/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/40+50/42 72/20+50/84 72/60+50/42