Add 20/42 and 70/15
1st number: 20/42, 2nd number: 4 10/15
20/42 + 70/15 is 36/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
20/42 = 20 × 5/42 × 5 = 100/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
70/15 = 70 × 14/15 × 14 = 980/210 - Add the two like fractions:
100/210 + 980/210 = 100 + 980/210 = 1080/210 - 1080/210 simplified gives 36/7
- So, 20/42 + 70/15 = 36/7
In mixed form: 51/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+70/15 20/84+70/15 20/42+70/30 60/42+70/15 20/42+70/45 20/42+70/75