Add 28/90 and 98/70
1st number: 28/90, 2nd number: 1 28/70
28/90 + 98/70 is 77/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
28/90 = 28 × 7/90 × 7 = 196/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
98/70 = 98 × 9/70 × 9 = 882/630 - Add the two like fractions:
196/630 + 882/630 = 196 + 882/630 = 1078/630 - 1078/630 simplified gives 77/45
- So, 28/90 + 98/70 = 77/45
In mixed form: 132/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90+98/70 84/90+98/70