Add 21/70 and 2/30
21/70 + 2/30 is 11/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
2/30 = 2 × 7/30 × 7 = 14/210 - Add the two like fractions:
63/210 + 14/210 = 63 + 14/210 = 77/210 - 77/210 simplified gives 11/30
- So, 21/70 + 2/30 = 11/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+2/30 21/70+4/30 21/70+2/60 63/70+2/30 21/70+6/30 21/70+2/90 21/70+10/30 21/70+14/30