Add 18/21 and 12/10
1st number: 18/21, 2nd number: 1 2/10
18/21 + 12/10 is 72/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
18/21 = 18 × 10/21 × 10 = 180/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
12/10 = 12 × 21/10 × 21 = 252/210 - Add the two like fractions:
180/210 + 252/210 = 180 + 252/210 = 432/210 - 432/210 simplified gives 72/35
- So, 18/21 + 12/10 = 72/35
In mixed form: 22/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+12/10 18/21+24/10 18/42+12/10 18/21+12/20 54/21+12/10 18/21+36/10 18/63+12/10 18/21+12/30 90/21+12/10 18/21+60/10 18/21+12/50 18/21+84/10 18/21+12/70