Add 90/20 and 54/84
1st number: 4 10/20, 2nd number: 54/84
90/20 + 54/84 is 36/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
90/20 = 90 × 21/20 × 21 = 1890/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
54/84 = 54 × 5/84 × 5 = 270/420 - Add the two like fractions:
1890/420 + 270/420 = 1890 + 270/420 = 2160/420 - 2160/420 simplified gives 36/7
- So, 90/20 + 54/84 = 36/7
In mixed form: 51/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40+54/84 90/60+54/84