Add 70/4 and 81/42
1st number: 17 2/4, 2nd number: 1 39/42
70/4 + 81/42 is 136/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
70/4 = 70 × 21/4 × 21 = 1470/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
81/42 = 81 × 2/42 × 2 = 162/84 - Add the two like fractions:
1470/84 + 162/84 = 1470 + 162/84 = 1632/84 - 1632/84 simplified gives 136/7
- So, 70/4 + 81/42 = 136/7
In mixed form: 193/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/8+81/42 70/4+81/84 70/12+81/42 70/20+81/42 70/28+81/42