Add 90/21 and 4/8
1st number: 4 6/21, 2nd number: 4/8
90/21 + 4/8 is 67/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
90/21 = 90 × 8/21 × 8 = 720/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
4/8 = 4 × 21/8 × 21 = 84/168 - Add the two like fractions:
720/168 + 84/168 = 720 + 84/168 = 804/168 - 804/168 simplified gives 67/14
- So, 90/21 + 4/8 = 67/14
In mixed form: 411/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+4/8 90/21+4/16 90/21+12/8 90/63+4/8 90/21+4/24 90/21+20/8 90/21+4/40 90/21+28/8 90/21+4/56