Add 9/8 and 7/21
1st number: 1 1/8, 2nd number: 7/21
9/8 + 7/21 is 35/24.
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,
9/8 = 9 × 21/8 × 21 = 189/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
7/21 = 7 × 8/21 × 8 = 56/168 - Add the two like fractions:
189/168 + 56/168 = 189 + 56/168 = 245/168 - 245/168 simplified gives 35/24
- So, 9/8 + 7/21 = 35/24
In mixed form: 111/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/8+7/21 9/8+14/21 9/16+7/21 9/8+7/42 27/8+7/21 9/24+7/21 9/8+7/63 45/8+7/21 9/8+35/21 9/40+7/21 63/8+7/21 9/8+49/21 9/56+7/21