Add 90/42 and 12/80
1st number: 2 6/42, 2nd number: 12/80
90/42 + 12/80 is 321/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
90/42 = 90 × 40/42 × 40 = 3600/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
12/80 = 12 × 21/80 × 21 = 252/1680 - Add the two like fractions:
3600/1680 + 252/1680 = 3600 + 252/1680 = 3852/1680 - 3852/1680 simplified gives 321/140
- So, 90/42 + 12/80 = 321/140
In mixed form: 241/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+24/80 90/84+12/80 90/42+36/80 90/42+60/80 90/42+84/80