Add 84/56 and 21/70
1st number: 1 28/56, 2nd number: 21/70
84/56 + 21/70 is 9/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 70 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 56 × 5 = 280,
84/56 = 84 × 5/56 × 5 = 420/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
21/70 = 21 × 4/70 × 4 = 84/280 - Add the two like fractions:
420/280 + 84/280 = 420 + 84/280 = 504/280 - 504/280 simplified gives 9/5
- So, 84/56 + 21/70 = 9/5
In mixed form: 14/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/56+42/70 84/56+63/70