Add 21/5 and 90/21
1st number: 4 1/5, 2nd number: 4 6/21
21/5 + 90/21 is 297/35.
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,
21/5 = 21 × 21/5 × 21 = 441/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
90/21 = 90 × 5/21 × 5 = 450/105 - Add the two like fractions:
441/105 + 450/105 = 441 + 450/105 = 891/105 - 891/105 simplified gives 297/35
- So, 21/5 + 90/21 = 297/35
In mixed form: 817/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+90/21 21/10+90/21 21/5+90/42 63/5+90/21 21/15+90/21 21/5+90/63 21/25+90/21 21/35+90/21