Add 90/4 and 5/21
1st number: 22 2/4, 2nd number: 5/21
90/4 + 5/21 is 955/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
90/4 = 90 × 21/4 × 21 = 1890/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
5/21 = 5 × 4/21 × 4 = 20/84 - Add the two like fractions:
1890/84 + 20/84 = 1890 + 20/84 = 1910/84 - 1910/84 simplified gives 955/42
- So, 90/4 + 5/21 = 955/42
In mixed form: 2231/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/4+10/21 90/8+5/21 90/4+5/42 90/4+15/21 90/12+5/21 90/4+5/63 90/4+25/21 90/20+5/21 90/4+35/21 90/28+5/21