Add 81/63 and 20/45
1st number: 1 18/63, 2nd number: 20/45
81/63 + 20/45 is 109/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 63 × 5 = 315,
81/63 = 81 × 5/63 × 5 = 405/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
20/45 = 20 × 7/45 × 7 = 140/315 - Add the two like fractions:
405/315 + 140/315 = 405 + 140/315 = 545/315 - 545/315 simplified gives 109/63
- So, 81/63 + 20/45 = 109/63
In mixed form: 146/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/63+40/45 81/63+20/90 81/63+60/45