Add 90/20 and 12/45
1st number: 4 10/20, 2nd number: 12/45
90/20 + 12/45 is 143/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
90/20 = 90 × 9/20 × 9 = 810/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
12/45 = 12 × 4/45 × 4 = 48/180 - Add the two like fractions:
810/180 + 48/180 = 810 + 48/180 = 858/180 - 858/180 simplified gives 143/30
- So, 90/20 + 12/45 = 143/30
In mixed form: 423/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+24/45 90/40+12/45 90/20+12/90 90/20+36/45 90/60+12/45 90/20+60/45 90/20+84/45