Add 9/30 and 9/21
9/30 + 9/21 is 51/70.
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,
9/30 = 9 × 7/30 × 7 = 63/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
9/21 = 9 × 10/21 × 10 = 90/210 - Add the two like fractions:
63/210 + 90/210 = 63 + 90/210 = 153/210 - 153/210 simplified gives 51/70
- So, 9/30 + 9/21 = 51/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/30+9/21 9/30+18/21 9/60+9/21 9/30+9/42 27/30+9/21 9/30+27/21 9/90+9/21 9/30+9/63 45/30+9/21 9/30+45/21 63/30+9/21 9/30+63/21