Add 7/81 and 40/42
7/81 + 40/42 is 589/567.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 42 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 81 × 14 = 1134,
7/81 = 7 × 14/81 × 14 = 98/1134 - Likewise, for the 2nd fraction, since 42 × 27 = 1134,
40/42 = 40 × 27/42 × 27 = 1080/1134 - Add the two like fractions:
98/1134 + 1080/1134 = 98 + 1080/1134 = 1178/1134 - 1178/1134 simplified gives 589/567
- So, 7/81 + 40/42 = 589/567
In mixed form: 122/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/81+40/42 7/81+80/42 7/81+40/84 21/81+40/42 35/81+40/42 49/81+40/42