Add 70/42 and 90/20
1st number: 1 28/42, 2nd number: 4 10/20
70/42 + 90/20 is 37/6.
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,
90/20 = 90 × 21/20 × 21 = 1890/420 - Add the two like fractions:
700/420 + 1890/420 = 700 + 1890/420 = 2590/420 - 2590/420 simplified gives 37/6
- So, 70/42 + 90/20 = 37/6
In mixed form: 61/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/84+90/20 70/42+90/40 70/42+90/60