Add 21/30 and 3/21
21/30 + 3/21 is 59/70.
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,
21/30 = 21 × 7/30 × 7 = 147/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
3/21 = 3 × 10/21 × 10 = 30/210 - Add the two like fractions:
147/210 + 30/210 = 147 + 30/210 = 177/210 - 177/210 simplified gives 59/70
- So, 21/30 + 3/21 = 59/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+3/21 21/30+6/21 21/60+3/21 21/30+3/42 63/30+3/21 21/30+9/21 21/90+3/21 21/30+3/63 21/30+15/21