Add 28/21 and 2/90
1st number: 1 7/21, 2nd number: 2/90
28/21 + 2/90 is 61/45.
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,
28/21 = 28 × 30/21 × 30 = 840/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
2/90 = 2 × 7/90 × 7 = 14/630 - Add the two like fractions:
840/630 + 14/630 = 840 + 14/630 = 854/630 - 854/630 simplified gives 61/45
- So, 28/21 + 2/90 = 61/45
In mixed form: 116/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+2/90 28/21+4/90 28/42+2/90 84/21+2/90 28/21+6/90 28/63+2/90 28/21+10/90 28/21+14/90