Add 21/15 and 5/80
1st number: 1 6/15, 2nd number: 5/80
21/15 + 5/80 is 117/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 80 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 80 × 3 = 240,
5/80 = 5 × 3/80 × 3 = 15/240 - Add the two like fractions:
336/240 + 15/240 = 336 + 15/240 = 351/240 - 351/240 simplified gives 117/80
- So, 21/15 + 5/80 = 117/80
In mixed form: 137/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+5/80 21/15+10/80 21/30+5/80 63/15+5/80 21/15+15/80 21/45+5/80 21/15+25/80 21/75+5/80 21/15+35/80