Add 21/10 and 75/21
1st number: 2 1/10, 2nd number: 3 12/21
21/10 + 75/21 is 397/70.
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,
21/10 = 21 × 21/10 × 21 = 441/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
75/21 = 75 × 10/21 × 10 = 750/210 - Add the two like fractions:
441/210 + 750/210 = 441 + 750/210 = 1191/210 - 1191/210 simplified gives 397/70
- So, 21/10 + 75/21 = 397/70
In mixed form: 547/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+75/21 21/20+75/21 21/10+75/42 63/10+75/21 21/30+75/21 21/10+75/63 21/50+75/21 21/70+75/21