Add 20/70 and 3/81
20/70 + 3/81 is 61/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 81 is 5670
Next, find the equivalent fraction of both fractional numbers with denominator 5670 - For the 1st fraction, since 70 × 81 = 5670,
20/70 = 20 × 81/70 × 81 = 1620/5670 - Likewise, for the 2nd fraction, since 81 × 70 = 5670,
3/81 = 3 × 70/81 × 70 = 210/5670 - Add the two like fractions:
1620/5670 + 210/5670 = 1620 + 210/5670 = 1830/5670 - 1830/5670 simplified gives 61/189
- So, 20/70 + 3/81 = 61/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70+3/81 20/70+6/81 60/70+3/81 20/70+9/81 20/70+15/81 20/70+21/81