Add 20/45 and 63/56
1st number: 20/45, 2nd number: 1 7/56
20/45 + 63/56 is 113/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 56 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 45 × 56 = 2520,
20/45 = 20 × 56/45 × 56 = 1120/2520 - Likewise, for the 2nd fraction, since 56 × 45 = 2520,
63/56 = 63 × 45/56 × 45 = 2835/2520 - Add the two like fractions:
1120/2520 + 2835/2520 = 1120 + 2835/2520 = 3955/2520 - 3955/2520 simplified gives 113/72
- So, 20/45 + 63/56 = 113/72
In mixed form: 141/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45+63/56 20/90+63/56 60/45+63/56