Add 21/84 and 75/8
1st number: 21/84, 2nd number: 9 3/8
21/84 + 75/8 is 77/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
21/84 = 21 × 2/84 × 2 = 42/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
75/8 = 75 × 21/8 × 21 = 1575/168 - Add the two like fractions:
42/168 + 1575/168 = 42 + 1575/168 = 1617/168 - 1617/168 simplified gives 77/8
- So, 21/84 + 75/8 = 77/8
In mixed form: 95/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+75/8 21/84+75/16 63/84+75/8 21/84+75/24 21/84+75/40 21/84+75/56