Add 10/30 and 18/42
10/30 + 18/42 is 16/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
10/30 = 10 × 7/30 × 7 = 70/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
18/42 = 18 × 5/42 × 5 = 90/210 - Add the two like fractions:
70/210 + 90/210 = 70 + 90/210 = 160/210 - 160/210 simplified gives 16/21
- So, 10/30 + 18/42 = 16/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/30+18/42 10/30+36/42 10/60+18/42 10/30+18/84 10/30+54/42 10/90+18/42 50/30+18/42 10/30+90/42 70/30+18/42