Add 81/70 and 5/42
1st number: 1 11/70, 2nd number: 5/42
81/70 + 5/42 is 134/105.
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,
81/70 = 81 × 3/70 × 3 = 243/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
5/42 = 5 × 5/42 × 5 = 25/210 - Add the two like fractions:
243/210 + 25/210 = 243 + 25/210 = 268/210 - 268/210 simplified gives 134/105
- So, 81/70 + 5/42 = 134/105
In mixed form: 129/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/70+10/42 81/70+5/84 81/70+15/42 81/70+25/42 81/70+35/42