Add 90/5 and 9/21
1st number: 18 0/5, 2nd number: 9/21
90/5 + 9/21 is 129/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
90/5 = 90 × 21/5 × 21 = 1890/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
9/21 = 9 × 5/21 × 5 = 45/105 - Add the two like fractions:
1890/105 + 45/105 = 1890 + 45/105 = 1935/105 - 1935/105 simplified gives 129/7
- So, 90/5 + 9/21 = 129/7
In mixed form: 183/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/5+18/21 90/10+9/21 90/5+9/42 90/5+27/21 90/15+9/21 90/5+9/63 90/5+45/21 90/25+9/21 90/5+63/21 90/35+9/21