Add 45/28 and 90/20
1st number: 1 17/28, 2nd number: 4 10/20
45/28 + 90/20 is 171/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
45/28 = 45 × 5/28 × 5 = 225/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
90/20 = 90 × 7/20 × 7 = 630/140 - Add the two like fractions:
225/140 + 630/140 = 225 + 630/140 = 855/140 - 855/140 simplified gives 171/28
- So, 45/28 + 90/20 = 171/28
In mixed form: 63/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/28+90/20 45/56+90/20 45/28+90/40 45/84+90/20 45/28+90/60