Add 72/8 and 21/84
1st number: 9 0/8, 2nd number: 21/84
72/8 + 21/84 is 37/4.
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,
72/8 = 72 × 21/8 × 21 = 1512/168 - Likewise, for the 2nd fraction, since 84 × 2 = 168,
21/84 = 21 × 2/84 × 2 = 42/168 - Add the two like fractions:
1512/168 + 42/168 = 1512 + 42/168 = 1554/168 - 1554/168 simplified gives 37/4
- So, 72/8 + 21/84 = 37/4
In mixed form: 91/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/8+42/84 72/16+21/84 72/8+63/84 72/24+21/84 72/40+21/84 72/56+21/84