Add 42/30 and 81/70
1st number: 1 12/30, 2nd number: 1 11/70
42/30 + 81/70 is 179/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
81/70 = 81 × 3/70 × 3 = 243/210 - Add the two like fractions:
294/210 + 243/210 = 294 + 243/210 = 537/210 - 537/210 simplified gives 179/70
- So, 42/30 + 81/70 = 179/70
In mixed form: 239/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30+81/70 42/60+81/70 42/90+81/70