Add 12/8 and 10/21
1st number: 1 4/8, 2nd number: 10/21
12/8 + 10/21 is 83/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
12/8 = 12 × 21/8 × 21 = 252/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
10/21 = 10 × 8/21 × 8 = 80/168 - Add the two like fractions:
252/168 + 80/168 = 252 + 80/168 = 332/168 - 332/168 simplified gives 83/42
- So, 12/8 + 10/21 = 83/42
In mixed form: 141/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/8+10/21 12/8+20/21 12/16+10/21 12/8+10/42 36/8+10/21 12/8+30/21 12/24+10/21 12/8+10/63 60/8+10/21 12/8+50/21 12/40+10/21 84/8+10/21 12/8+70/21 12/56+10/21