Add 90/20 and 35/81
1st number: 4 10/20, 2nd number: 35/81
90/20 + 35/81 is 799/162.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
90/20 = 90 × 81/20 × 81 = 7290/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
35/81 = 35 × 20/81 × 20 = 700/1620 - Add the two like fractions:
7290/1620 + 700/1620 = 7290 + 700/1620 = 7990/1620 - 7990/1620 simplified gives 799/162
- So, 90/20 + 35/81 = 799/162
In mixed form: 4151/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+70/81 90/40+35/81 90/60+35/81