Add 21/70 and 1/30
21/70 + 1/30 is 1/3.
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,
1/30 = 1 × 7/30 × 7 = 7/210 - Add the two like fractions:
63/210 + 7/210 = 63 + 7/210 = 70/210 - 70/210 simplified gives 1/3
- So, 21/70 + 1/30 = 1/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+1/30 21/70+2/30 21/70+1/60 63/70+1/30 21/70+3/30 21/70+1/90 21/70+5/30 21/70+7/30