Add 35/10 and 42/21
1st number: 3 5/10, 2nd number: 2 0/21
35/10 + 42/21 is 11/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
35/10 = 35 × 21/10 × 21 = 735/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
42/21 = 42 × 10/21 × 10 = 420/210 - Add the two like fractions:
735/210 + 420/210 = 735 + 420/210 = 1155/210 - 1155/210 simplified gives 11/2
- So, 35/10 + 42/21 = 11/2
In mixed form: 51/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/10+42/21 35/10+84/21 35/20+42/21 35/30+42/21 35/10+42/63 35/50+42/21 35/70+42/21