Add 90/20 and 40/28
1st number: 4 10/20, 2nd number: 1 12/28
90/20 + 40/28 is 83/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
90/20 = 90 × 7/20 × 7 = 630/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
40/28 = 40 × 5/28 × 5 = 200/140 - Add the two like fractions:
630/140 + 200/140 = 630 + 200/140 = 830/140 - 830/140 simplified gives 83/14
- So, 90/20 + 40/28 = 83/14
In mixed form: 513/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+80/28 90/40+40/28 90/20+40/56 90/60+40/28 90/20+40/84