Add 90/70 and 45/28
1st number: 1 20/70, 2nd number: 1 17/28
90/70 + 45/28 is 81/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
90/70 = 90 × 2/70 × 2 = 180/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
45/28 = 45 × 5/28 × 5 = 225/140 - Add the two like fractions:
180/140 + 225/140 = 180 + 225/140 = 405/140 - 405/140 simplified gives 81/28
- So, 90/70 + 45/28 = 81/28
In mixed form: 225/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70+90/28 90/70+45/56 90/70+45/84