Add 15/84 and 56/20
1st number: 15/84, 2nd number: 2 16/20
15/84 + 56/20 is 417/140.
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,
15/84 = 15 × 5/84 × 5 = 75/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
56/20 = 56 × 21/20 × 21 = 1176/420 - Add the two like fractions:
75/420 + 1176/420 = 75 + 1176/420 = 1251/420 - 1251/420 simplified gives 417/140
- So, 15/84 + 56/20 = 417/140
In mixed form: 2137/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/84+56/20 15/84+56/40 45/84+56/20 15/84+56/60 75/84+56/20