Add 10/30 and 21/70
10/30 + 21/70 is 19/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
10/30 = 10 × 7/30 × 7 = 70/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Add the two like fractions:
70/210 + 63/210 = 70 + 63/210 = 133/210 - 133/210 simplified gives 19/30
- So, 10/30 + 21/70 = 19/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/30+21/70 10/30+42/70 10/60+21/70 10/30+63/70 10/90+21/70 50/30+21/70 70/30+21/70