Add 90/21 and 50/42
1st number: 4 6/21, 2nd number: 1 8/42
90/21 + 50/42 is 115/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
90/21 = 90 × 2/21 × 2 = 180/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
50/42 = 50 × 1/42 × 1 = 50/42 - Add the two like fractions:
180/42 + 50/42 = 180 + 50/42 = 230/42 - 230/42 simplified gives 115/21
- So, 90/21 + 50/42 = 115/21
In mixed form: 510/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+50/42 90/21+50/84 90/63+50/42