Add 42/20 and 30/81
1st number: 2 2/20, 2nd number: 30/81
42/20 + 30/81 is 667/270.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
42/20 = 42 × 81/20 × 81 = 3402/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
30/81 = 30 × 20/81 × 20 = 600/1620 - Add the two like fractions:
3402/1620 + 600/1620 = 3402 + 600/1620 = 4002/1620 - 4002/1620 simplified gives 667/270
- So, 42/20 + 30/81 = 667/270
In mixed form: 2127/270
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20+30/81 42/20+60/81 42/40+30/81 42/20+90/81 42/60+30/81