Add 3/7 and 42/81
3/7 + 42/81 is 179/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 7 × 81 = 567,
3/7 = 3 × 81/7 × 81 = 243/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
42/81 = 42 × 7/81 × 7 = 294/567 - Add the two like fractions:
243/567 + 294/567 = 243 + 294/567 = 537/567 - 537/567 simplified gives 179/189
- So, 3/7 + 42/81 = 179/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7+42/81 3/7+84/81 3/14+42/81 9/7+42/81 3/21+42/81 15/7+42/81 3/35+42/81 21/7+42/81 3/49+42/81