Add 63/21 and 72/80
1st number: 3 0/21, 2nd number: 72/80
63/21 + 72/80 is 39/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
63/21 = 63 × 80/21 × 80 = 5040/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
72/80 = 72 × 21/80 × 21 = 1512/1680 - Add the two like fractions:
5040/1680 + 1512/1680 = 5040 + 1512/1680 = 6552/1680 - 6552/1680 simplified gives 39/10
- So, 63/21 + 72/80 = 39/10
In mixed form: 39/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/42+72/80