Add 21/70 and 4/30
21/70 + 4/30 is 13/30.
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,
4/30 = 4 × 7/30 × 7 = 28/210 - Add the two like fractions:
63/210 + 28/210 = 63 + 28/210 = 91/210 - 91/210 simplified gives 13/30
- So, 21/70 + 4/30 = 13/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+4/30 21/70+8/30 21/70+4/60 63/70+4/30 21/70+12/30 21/70+4/90 21/70+20/30 21/70+28/30