Add 90/12 and 30/42
1st number: 7 6/12, 2nd number: 30/42
90/12 + 30/42 is 115/14.
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,
30/42 = 30 × 2/42 × 2 = 60/84 - Add the two like fractions:
630/84 + 60/84 = 630 + 60/84 = 690/84 - 690/84 simplified gives 115/14
- So, 90/12 + 30/42 = 115/14
In mixed form: 83/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+60/42 90/24+30/42 90/12+30/84 90/12+90/42 90/36+30/42 90/60+30/42 90/84+30/42