Add 81/2 and 42/70
1st number: 40 1/2, 2nd number: 42/70
81/2 + 42/70 is 411/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 2 × 35 = 70,
81/2 = 81 × 35/2 × 35 = 2835/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
42/70 = 42 × 1/70 × 1 = 42/70 - Add the two like fractions:
2835/70 + 42/70 = 2835 + 42/70 = 2877/70 - 2877/70 simplified gives 411/10
- So, 81/2 + 42/70 = 411/10
In mixed form: 411/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/2+84/70 81/4+42/70 81/6+42/70 81/10+42/70 81/14+42/70