Add 10/21 and 90/15
1st number: 10/21, 2nd number: 6 0/15
10/21 + 90/15 is 136/21.
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,
10/21 = 10 × 5/21 × 5 = 50/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
90/15 = 90 × 7/15 × 7 = 630/105 - Add the two like fractions:
50/105 + 630/105 = 50 + 630/105 = 680/105 - 680/105 simplified gives 136/21
- So, 10/21 + 90/15 = 136/21
In mixed form: 610/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+90/15 10/42+90/15 10/21+90/30 30/21+90/15 10/63+90/15 10/21+90/45 50/21+90/15 10/21+90/75 70/21+90/15