Add 21/15 and 84/16
1st number: 1 6/15, 2nd number: 5 4/16
21/15 + 84/16 is 133/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 16 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 15 × 16 = 240,
21/15 = 21 × 16/15 × 16 = 336/240 - Likewise, for the 2nd fraction, since 16 × 15 = 240,
84/16 = 84 × 15/16 × 15 = 1260/240 - Add the two like fractions:
336/240 + 1260/240 = 336 + 1260/240 = 1596/240 - 1596/240 simplified gives 133/20
- So, 21/15 + 84/16 = 133/20
In mixed form: 613/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+84/16 21/30+84/16 21/15+84/32 63/15+84/16 21/45+84/16 21/15+84/48 21/75+84/16 21/15+84/80