Add 20/35 and 7/42
20/35 + 7/42 is 31/42.
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,
20/35 = 20 × 6/35 × 6 = 120/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
7/42 = 7 × 5/42 × 5 = 35/210 - Add the two like fractions:
120/210 + 35/210 = 120 + 35/210 = 155/210 - 155/210 simplified gives 31/42
- So, 20/35 + 7/42 = 31/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/35+7/42 20/35+14/42 20/70+7/42 20/35+7/84 60/35+7/42 20/35+21/42 20/35+35/42 20/35+49/42