Add 21/12 and 10/21
1st number: 1 9/12, 2nd number: 10/21
2112 + 1021 is 18784.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
2112 = 21 × 712 × 7 = 14784 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
1021 = 10 × 421 × 4 = 4084 - Add the two like fractions:
14784 + 4084 = 147 + 4084 = 18784 - So, 21/12 + 10/21 = 187/84
In mixed form: 21984
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+10/21 21/12+20/21 21/24+10/21 21/12+10/42 63/12+10/21 21/12+30/21 21/36+10/21 21/12+10/63 21/12+50/21 21/60+10/21 21/12+70/21 21/84+10/21