Add 70/42 and 5/20
1st number: 1 28/42, 2nd number: 5/20
70/42 + 5/20 is 23/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
70/42 = 70 × 10/42 × 10 = 700/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Add the two like fractions:
700/420 + 105/420 = 700 + 105/420 = 805/420 - 805/420 simplified gives 23/12
- So, 70/42 + 5/20 = 23/12
In mixed form: 111/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42+10/20 70/84+5/20 70/42+5/40 70/42+15/20 70/42+5/60 70/42+25/20 70/42+35/20