Add 3/21 and 10/5
1st number: 3/21, 2nd number: 2 0/5
3/21 + 10/5 is 15/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
3/21 = 3 × 5/21 × 5 = 15/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
10/5 = 10 × 21/5 × 21 = 210/105 - Add the two like fractions:
15/105 + 210/105 = 15 + 210/105 = 225/105 - 225/105 simplified gives 15/7
- So, 3/21 + 10/5 = 15/7
In mixed form: 21/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+10/5 3/21+20/5 3/42+10/5 9/21+10/5 3/21+30/5 3/63+10/5 3/21+10/15 15/21+10/5 3/21+50/5 3/21+10/25 3/21+70/5 3/21+10/35