Add 20/84 and 90/7
1st number: 20/84, 2nd number: 12 6/7
20/84 + 90/7 is 275/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
20/84 = 20 × 1/84 × 1 = 20/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
90/7 = 90 × 12/7 × 12 = 1080/84 - Add the two like fractions:
20/84 + 1080/84 = 20 + 1080/84 = 1100/84 - 1100/84 simplified gives 275/21
- So, 20/84 + 90/7 = 275/21
In mixed form: 132/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84+90/7 20/84+90/14 60/84+90/7 20/84+90/21 20/84+90/35 20/84+90/49