Add 63/42 and 9/80
1st number: 1 21/42, 2nd number: 9/80
63/42 + 9/80 is 129/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
63/42 = 63 × 40/42 × 40 = 2520/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
9/80 = 9 × 21/80 × 21 = 189/1680 - Add the two like fractions:
2520/1680 + 189/1680 = 2520 + 189/1680 = 2709/1680 - 2709/1680 simplified gives 129/80
- So, 63/42 + 9/80 = 129/80
In mixed form: 149/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/42+18/80 63/84+9/80 63/42+27/80 63/42+45/80 63/42+63/80