Add 35/42 and 81/80
1st number: 35/42, 2nd number: 1 1/80
35/42 + 81/80 is 443/240.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
35/42 = 35 × 40/42 × 40 = 1400/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
81/80 = 81 × 21/80 × 21 = 1701/1680 - Add the two like fractions:
1400/1680 + 1701/1680 = 1400 + 1701/1680 = 3101/1680 - 3101/1680 simplified gives 443/240
- So, 35/42 + 81/80 = 443/240
In mixed form: 1203/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42+81/80 35/84+81/80