Add 28/10 and 42/84
1st number: 2 8/10, 2nd number: 42/84
28/10 + 42/84 is 33/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 10 × 42 = 420,
28/10 = 28 × 42/10 × 42 = 1176/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
42/84 = 42 × 5/84 × 5 = 210/420 - Add the two like fractions:
1176/420 + 210/420 = 1176 + 210/420 = 1386/420 - 1386/420 simplified gives 33/10
- So, 28/10 + 42/84 = 33/10
In mixed form: 33/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/10+42/84 28/20+42/84 84/10+42/84 28/30+42/84 28/50+42/84 28/70+42/84