Add 7/30 and 3/21
7/30 + 3/21 is 79/210.
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,
7/30 = 7 × 7/30 × 7 = 49/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
3/21 = 3 × 10/21 × 10 = 30/210 - Add the two like fractions:
49/210 + 30/210 = 49 + 30/210 = 79/210 - So, 7/30 + 3/21 = 79/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/30+3/21 7/30+6/21 7/60+3/21 7/30+3/42 21/30+3/21 7/30+9/21 7/90+3/21 7/30+3/63 35/30+3/21 7/30+15/21 49/30+3/21