Add 12/4 and 10/21
1st number: 3 0/4, 2nd number: 10/21
12/4 + 10/21 is 73/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
12/4 = 12 × 21/4 × 21 = 252/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
10/21 = 10 × 4/21 × 4 = 40/84 - Add the two like fractions:
252/84 + 40/84 = 252 + 40/84 = 292/84 - 292/84 simplified gives 73/21
- So, 12/4 + 10/21 = 73/21
In mixed form: 310/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/4+10/21 12/4+20/21 12/8+10/21 12/4+10/42 36/4+10/21 12/4+30/21 12/4+10/63 60/4+10/21 12/4+50/21 12/20+10/21 84/4+10/21 12/4+70/21 12/28+10/21