Add 81/70 and 30/20
1st number: 1 11/70, 2nd number: 1 10/20
81/70 + 30/20 is 93/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
81/70 = 81 × 2/70 × 2 = 162/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
30/20 = 30 × 7/20 × 7 = 210/140 - Add the two like fractions:
162/140 + 210/140 = 162 + 210/140 = 372/140 - 372/140 simplified gives 93/35
- So, 81/70 + 30/20 = 93/35
In mixed form: 223/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/70+60/20 81/70+30/40 81/70+90/20 81/70+30/60