Add 81/63 and 20/30
1st number: 1 18/63, 2nd number: 20/30
81/63 + 20/30 is 41/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 30 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 63 × 10 = 630,
81/63 = 81 × 10/63 × 10 = 810/630 - Likewise, for the 2nd fraction, since 30 × 21 = 630,
20/30 = 20 × 21/30 × 21 = 420/630 - Add the two like fractions:
810/630 + 420/630 = 810 + 420/630 = 1230/630 - 1230/630 simplified gives 41/21
- So, 81/63 + 20/30 = 41/21
In mixed form: 120/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/63+40/30 81/63+20/60 81/63+60/30 81/63+20/90