Add 3/30 and 21/70
3/30 + 21/70 is 2/5.
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,
3/30 = 3 × 7/30 × 7 = 21/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Add the two like fractions:
21/210 + 63/210 = 21 + 63/210 = 84/210 - 84/210 simplified gives 2/5
- So, 3/30 + 21/70 = 2/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/30+21/70 3/30+42/70 3/60+21/70 9/30+21/70 3/30+63/70 3/90+21/70 15/30+21/70 21/30+21/70