Add 4/10 and 81/42
1st number: 4/10, 2nd number: 1 39/42
4/10 + 81/42 is 163/70.
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,
4/10 = 4 × 21/10 × 21 = 84/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
81/42 = 81 × 5/42 × 5 = 405/210 - Add the two like fractions:
84/210 + 405/210 = 84 + 405/210 = 489/210 - 489/210 simplified gives 163/70
- So, 4/10 + 81/42 = 163/70
In mixed form: 223/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/10+81/42 4/20+81/42 4/10+81/84 12/10+81/42 4/30+81/42 20/10+81/42 4/50+81/42 28/10+81/42 4/70+81/42