Add 70/42 and 3/80
1st number: 1 28/42, 2nd number: 3/80
70/42 + 3/80 is 409/240.
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,
70/42 = 70 × 40/42 × 40 = 2800/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
3/80 = 3 × 21/80 × 21 = 63/1680 - Add the two like fractions:
2800/1680 + 63/1680 = 2800 + 63/1680 = 2863/1680 - 2863/1680 simplified gives 409/240
- So, 70/42 + 3/80 = 409/240
In mixed form: 1169/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42+6/80 70/84+3/80 70/42+9/80 70/42+15/80 70/42+21/80