Add 90/35 and 3/21
1st number: 2 20/35, 2nd number: 3/21
90/35 + 3/21 is 19/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 35 × 3 = 105,
90/35 = 90 × 3/35 × 3 = 270/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
3/21 = 3 × 5/21 × 5 = 15/105 - Add the two like fractions:
270/105 + 15/105 = 270 + 15/105 = 285/105 - 285/105 simplified gives 19/7
- So, 90/35 + 3/21 = 19/7
In mixed form: 25/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/35+6/21 90/70+3/21 90/35+3/42 90/35+9/21 90/35+3/63 90/35+15/21