Add 75/21 and 15/30
1st number: 3 12/21, 2nd number: 15/30
75/21 + 15/30 is 57/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
75/21 = 75 × 10/21 × 10 = 750/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
15/30 = 15 × 7/30 × 7 = 105/210 - Add the two like fractions:
750/210 + 105/210 = 750 + 105/210 = 855/210 - 855/210 simplified gives 57/14
- So, 75/21 + 15/30 = 57/14
In mixed form: 41/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/42+15/30 75/21+15/60 75/21+45/30 75/63+15/30 75/21+15/90 75/21+75/30