Add 21/35 and 28/30
21/35 + 28/30 is 23/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 35 × 6 = 210,
21/35 = 21 × 6/35 × 6 = 126/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
28/30 = 28 × 7/30 × 7 = 196/210 - Add the two like fractions:
126/210 + 196/210 = 126 + 196/210 = 322/210 - 322/210 simplified gives 23/15
- So, 21/35 + 28/30 = 23/15
In mixed form: 18/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35+28/30 21/35+56/30 21/70+28/30 21/35+28/60 63/35+28/30 21/35+84/30 21/35+28/90