Add 20/35 and 90/42
1st number: 20/35, 2nd number: 2 6/42
20/35 + 90/42 is 19/7.
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,
90/42 = 90 × 5/42 × 5 = 450/210 - Add the two like fractions:
120/210 + 450/210 = 120 + 450/210 = 570/210 - 570/210 simplified gives 19/7
- So, 20/35 + 90/42 = 19/7
In mixed form: 25/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/35+90/42 20/70+90/42 20/35+90/84 60/35+90/42