Add 42/35 and 18/20
1st number: 1 7/35, 2nd number: 18/20
42/35 + 18/20 is 21/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 35 × 4 = 140,
42/35 = 42 × 4/35 × 4 = 168/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
18/20 = 18 × 7/20 × 7 = 126/140 - Add the two like fractions:
168/140 + 126/140 = 168 + 126/140 = 294/140 - 294/140 simplified gives 21/10
- So, 42/35 + 18/20 = 21/10
In mixed form: 21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/35+18/20 42/35+36/20 42/70+18/20 42/35+18/40 42/35+54/20 42/35+18/60 42/35+90/20