Add 18/20 and 54/42
1st number: 18/20, 2nd number: 1 12/42
18/20 + 54/42 is 153/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
18/20 = 18 × 21/20 × 21 = 378/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
54/42 = 54 × 10/42 × 10 = 540/420 - Add the two like fractions:
378/420 + 540/420 = 378 + 540/420 = 918/420 - 918/420 simplified gives 153/70
- So, 18/20 + 54/42 = 153/70
In mixed form: 213/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20+54/42 18/40+54/42 18/20+54/84 54/20+54/42 18/60+54/42 90/20+54/42