Add 7/42 and 63/81
7/42 + 63/81 is 17/18.
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,
7/42 = 7 × 27/42 × 27 = 189/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
63/81 = 63 × 14/81 × 14 = 882/1134 - Add the two like fractions:
189/1134 + 882/1134 = 189 + 882/1134 = 1071/1134 - 1071/1134 simplified gives 17/18
- So, 7/42 + 63/81 = 17/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42+63/81 7/84+63/81 21/42+63/81 35/42+63/81 49/42+63/81