Add 20/90 and 84/56
1st number: 20/90, 2nd number: 1 28/56
20/90 + 84/56 is 31/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 56 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 90 × 28 = 2520,
20/90 = 20 × 28/90 × 28 = 560/2520 - Likewise, for the 2nd fraction, since 56 × 45 = 2520,
84/56 = 84 × 45/56 × 45 = 3780/2520 - Add the two like fractions:
560/2520 + 3780/2520 = 560 + 3780/2520 = 4340/2520 - 4340/2520 simplified gives 31/18
- So, 20/90 + 84/56 = 31/18
In mixed form: 113/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90+84/56 60/90+84/56