Add 90/21 and 30/15
1st number: 4 6/21, 2nd number: 2 0/15
90/21 + 30/15 is 44/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
90/21 = 90 × 5/21 × 5 = 450/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
30/15 = 30 × 7/15 × 7 = 210/105 - Add the two like fractions:
450/105 + 210/105 = 450 + 210/105 = 660/105 - 660/105 simplified gives 44/7
- So, 90/21 + 30/15 = 44/7
In mixed form: 62/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+60/15 90/42+30/15 90/21+90/15 90/63+30/15 90/21+30/45 90/21+30/75