Add 90/42 and 21/4
1st number: 2 6/42, 2nd number: 5 1/4
90/42 + 21/4 is 207/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
90/42 = 90 × 2/42 × 2 = 180/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
21/4 = 21 × 21/4 × 21 = 441/84 - Add the two like fractions:
180/84 + 441/84 = 180 + 441/84 = 621/84 - 621/84 simplified gives 207/28
- So, 90/42 + 21/4 = 207/28
In mixed form: 711/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+42/4 90/84+21/4 90/42+21/8 90/42+63/4 90/42+21/12 90/42+21/20 90/42+21/28