Add 30/70 and 18/42
30/70 + 18/42 is 6/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
30/70 = 30 × 3/70 × 3 = 90/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
18/42 = 18 × 5/42 × 5 = 90/210 - Add the two like fractions:
90/210 + 90/210 = 90 + 90/210 = 180/210 - 180/210 simplified gives 6/7
- So, 30/70 + 18/42 = 6/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+18/42 30/70+36/42 30/70+18/84 90/70+18/42 30/70+54/42 30/70+90/42