Add 70/42 and 4/81
1st number: 1 28/42, 2nd number: 4/81
70/42 + 4/81 is 139/81.
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,
4/81 = 4 × 14/81 × 14 = 56/1134 - Add the two like fractions:
1890/1134 + 56/1134 = 1890 + 56/1134 = 1946/1134 - 1946/1134 simplified gives 139/81
- So, 70/42 + 4/81 = 139/81
In mixed form: 158/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42+8/81 70/84+4/81 70/42+12/81 70/42+20/81 70/42+28/81