Add 21/35 and 14/42
21/35 + 14/42 is 14/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 42 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 42 × 5 = 210,
14/42 = 14 × 5/42 × 5 = 70/210 - Add the two like fractions:
126/210 + 70/210 = 126 + 70/210 = 196/210 - 196/210 simplified gives 14/15
- So, 21/35 + 14/42 = 14/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35+14/42 21/35+28/42 21/70+14/42 21/35+14/84 63/35+14/42 21/35+70/42 21/35+98/42