Add 20/42 and 90/54
1st number: 20/42, 2nd number: 1 36/54
20/42 + 90/54 is 15/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
20/42 = 20 × 9/42 × 9 = 180/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
90/54 = 90 × 7/54 × 7 = 630/378 - Add the two like fractions:
180/378 + 630/378 = 180 + 630/378 = 810/378 - 810/378 simplified gives 15/7
- So, 20/42 + 90/54 = 15/7
In mixed form: 21/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+90/54 20/84+90/54 60/42+90/54