Add 20/35 and 4/21
20/35 + 4/21 is 16/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 35 × 3 = 105,
20/35 = 20 × 3/35 × 3 = 60/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
4/21 = 4 × 5/21 × 5 = 20/105 - Add the two like fractions:
60/105 + 20/105 = 60 + 20/105 = 80/105 - 80/105 simplified gives 16/21
- So, 20/35 + 4/21 = 16/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/35+4/21 20/35+8/21 20/70+4/21 20/35+4/42 60/35+4/21 20/35+12/21 20/35+4/63 20/35+20/21 20/35+28/21