Add 18/63 and 20/30
18/63 + 20/30 is 20/21.
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,
18/63 = 18 × 10/63 × 10 = 180/630 - Likewise, for the 2nd fraction, since 30 × 21 = 630,
20/30 = 20 × 21/30 × 21 = 420/630 - Add the two like fractions:
180/630 + 420/630 = 180 + 420/630 = 600/630 - 600/630 simplified gives 20/21
- So, 18/63 + 20/30 = 20/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/63+20/30 18/63+40/30 18/63+20/60 54/63+20/30 18/63+60/30 18/63+20/90 90/63+20/30