Add 90/20 and 30/5
1st number: 4 10/20, 2nd number: 6 0/5
90/20 + 30/5 is 21/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
90/20 = 90 × 1/20 × 1 = 90/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
30/5 = 30 × 4/5 × 4 = 120/20 - Add the two like fractions:
90/20 + 120/20 = 90 + 120/20 = 210/20 - 210/20 simplified gives 21/2
- So, 90/20 + 30/5 = 21/2
In mixed form: 101/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+60/5 90/40+30/5 90/20+30/10 90/20+90/5 90/60+30/5 90/20+30/15 90/20+30/25 90/20+30/35