Add 20/42 and 63/45
1st number: 20/42, 2nd number: 1 18/45
20/42 + 63/45 is 197/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
20/42 = 20 × 15/42 × 15 = 300/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
63/45 = 63 × 14/45 × 14 = 882/630 - Add the two like fractions:
300/630 + 882/630 = 300 + 882/630 = 1182/630 - 1182/630 simplified gives 197/105
- So, 20/42 + 63/45 = 197/105
In mixed form: 192/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+63/45 20/84+63/45 20/42+63/90 60/42+63/45