Add 70/42 and 20/81
1st number: 1 28/42, 2nd number: 20/81
70/42 + 20/81 is 155/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 81 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 42 × 27 = 1134,
70/42 = 70 × 27/42 × 27 = 1890/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
20/81 = 20 × 14/81 × 14 = 280/1134 - Add the two like fractions:
1890/1134 + 280/1134 = 1890 + 280/1134 = 2170/1134 - 2170/1134 simplified gives 155/81
- So, 70/42 + 20/81 = 155/81
In mixed form: 174/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42+40/81 70/84+20/81 70/42+60/81