Add 35/90 and 81/21
1st number: 35/90, 2nd number: 3 18/21
35/90 + 81/21 is 535/126.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
35/90 = 35 × 7/90 × 7 = 245/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
81/21 = 81 × 30/21 × 30 = 2430/630 - Add the two like fractions:
245/630 + 2430/630 = 245 + 2430/630 = 2675/630 - 2675/630 simplified gives 535/126
- So, 35/90 + 81/21 = 535/126
In mixed form: 431/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90+81/21 35/90+81/42 35/90+81/63