Add 12/5 and 90/21
1st number: 2 2/5, 2nd number: 4 6/21
12/5 + 90/21 is 234/35.
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,
12/5 = 12 × 21/5 × 21 = 252/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
90/21 = 90 × 5/21 × 5 = 450/105 - Add the two like fractions:
252/105 + 450/105 = 252 + 450/105 = 702/105 - 702/105 simplified gives 234/35
- So, 12/5 + 90/21 = 234/35
In mixed form: 624/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/5+90/21 12/10+90/21 12/5+90/42 36/5+90/21 12/15+90/21 12/5+90/63 60/5+90/21 12/25+90/21 84/5+90/21 12/35+90/21