Add 20/84 and 72/56
1st number: 20/84, 2nd number: 1 16/56
20/84 + 72/56 is 32/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
20/84 = 20 × 2/84 × 2 = 40/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
72/56 = 72 × 3/56 × 3 = 216/168 - Add the two like fractions:
40/168 + 216/168 = 40 + 216/168 = 256/168 - 256/168 simplified gives 32/21
- So, 20/84 + 72/56 = 32/21
In mixed form: 111/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84+72/56 60/84+72/56