Add 42/63 and 16/81
42/63 + 16/81 is 70/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 63 × 9 = 567,
42/63 = 42 × 9/63 × 9 = 378/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
16/81 = 16 × 7/81 × 7 = 112/567 - Add the two like fractions:
378/567 + 112/567 = 378 + 112/567 = 490/567 - 490/567 simplified gives 70/81
- So, 42/63 + 16/81 = 70/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/63+16/81 42/63+32/81 42/63+48/81 42/63+80/81