Add 90/12 and 20/42
1st number: 7 6/12, 2nd number: 20/42
90/12 + 20/42 is 335/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
90/12 = 90 × 7/12 × 7 = 630/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
20/42 = 20 × 2/42 × 2 = 40/84 - Add the two like fractions:
630/84 + 40/84 = 630 + 40/84 = 670/84 - 670/84 simplified gives 335/42
- So, 90/12 + 20/42 = 335/42
In mixed form: 741/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+40/42 90/24+20/42 90/12+20/84 90/12+60/42 90/36+20/42 90/60+20/42 90/84+20/42