Add 63/21 and 90/12
1st number: 3 0/21, 2nd number: 7 6/12
63/21 + 90/12 is 21/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
63/21 = 63 × 4/21 × 4 = 252/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
90/12 = 90 × 7/12 × 7 = 630/84 - Add the two like fractions:
252/84 + 630/84 = 252 + 630/84 = 882/84 - 882/84 simplified gives 21/2
- So, 63/21 + 90/12 = 21/2
In mixed form: 101/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/42+90/12 63/21+90/24 63/21+90/36 63/21+90/60 63/21+90/84