Add 25/30 and 5/21
25/30 + 5/21 is 15/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
25/30 = 25 × 7/30 × 7 = 175/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
5/21 = 5 × 10/21 × 10 = 50/210 - Add the two like fractions:
175/210 + 50/210 = 175 + 50/210 = 225/210 - 225/210 simplified gives 15/14
- So, 25/30 + 5/21 = 15/14
In mixed form: 11/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/30+5/21 25/30+10/21 25/60+5/21 25/30+5/42 75/30+5/21 25/30+15/21 25/90+5/21 25/30+5/63 25/30+25/21 25/30+35/21