Add 75/21 and 90/35
1st number: 3 12/21, 2nd number: 2 20/35
75/21 + 90/35 is 43/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 35 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
75/21 = 75 × 5/21 × 5 = 375/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
90/35 = 90 × 3/35 × 3 = 270/105 - Add the two like fractions:
375/105 + 270/105 = 375 + 270/105 = 645/105 - 645/105 simplified gives 43/7
- So, 75/21 + 90/35 = 43/7
In mixed form: 61/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/42+90/35 75/21+90/70 75/63+90/35