Add 90/20 and 45/15
1st number: 4 10/20, 2nd number: 3 0/15
90/20 + 45/15 is 15/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
90/20 = 90 × 3/20 × 3 = 270/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
45/15 = 45 × 4/15 × 4 = 180/60 - Add the two like fractions:
270/60 + 180/60 = 270 + 180/60 = 450/60 - 450/60 simplified gives 15/2
- So, 90/20 + 45/15 = 15/2
In mixed form: 71/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+90/15 90/40+45/15 90/20+45/30 90/60+45/15 90/20+45/75