Add 75/84 and 72/20
1st number: 75/84, 2nd number: 3 12/20
75/84 + 72/20 is 629/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
75/84 = 75 × 5/84 × 5 = 375/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
72/20 = 72 × 21/20 × 21 = 1512/420 - Add the two like fractions:
375/420 + 1512/420 = 375 + 1512/420 = 1887/420 - 1887/420 simplified gives 629/140
- So, 75/84 + 72/20 = 629/140
In mixed form: 469/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/84+72/40 75/84+72/60