Add 56/21 and 72/90
1st number: 2 14/21, 2nd number: 72/90
56/21 + 72/90 is 52/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
56/21 = 56 × 30/21 × 30 = 1680/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
72/90 = 72 × 7/90 × 7 = 504/630 - Add the two like fractions:
1680/630 + 504/630 = 1680 + 504/630 = 2184/630 - 2184/630 simplified gives 52/15
- So, 56/21 + 72/90 = 52/15
In mixed form: 37/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42+72/90 56/63+72/90