Add 42/8 and 21/84
1st number: 5 2/8, 2nd number: 21/84
42/8 + 21/84 is 11/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 84 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
42/8 = 42 × 21/8 × 21 = 882/168 - Likewise, for the 2nd fraction, since 84 × 2 = 168,
21/84 = 21 × 2/84 × 2 = 42/168 - Add the two like fractions:
882/168 + 42/168 = 882 + 42/168 = 924/168 - 924/168 simplified gives 11/2
- So, 42/8 + 21/84 = 11/2
In mixed form: 51/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8+21/84 42/8+42/84 42/16+21/84 42/8+63/84 42/24+21/84 42/40+21/84 42/56+21/84