Add 3/10 and 81/42
1st number: 3/10, 2nd number: 1 39/42
3/10 + 81/42 is 78/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
3/10 = 3 × 21/10 × 21 = 63/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
81/42 = 81 × 5/42 × 5 = 405/210 - Add the two like fractions:
63/210 + 405/210 = 63 + 405/210 = 468/210 - 468/210 simplified gives 78/35
- So, 3/10 + 81/42 = 78/35
In mixed form: 28/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/10+81/42 3/20+81/42 3/10+81/84 9/10+81/42 3/30+81/42 15/10+81/42 3/50+81/42 21/10+81/42 3/70+81/42