Add 90/28 and 10/21
1st number: 3 6/28, 2nd number: 10/21
90/28 + 10/21 is 155/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
90/28 = 90 × 3/28 × 3 = 270/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
10/21 = 10 × 4/21 × 4 = 40/84 - Add the two like fractions:
270/84 + 40/84 = 270 + 40/84 = 310/84 - 310/84 simplified gives 155/42
- So, 90/28 + 10/21 = 155/42
In mixed form: 329/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/28+20/21 90/56+10/21 90/28+10/42 90/28+30/21 90/84+10/21 90/28+10/63 90/28+50/21 90/28+70/21