Add 72/2 and 90/20
1st number: 36 0/2, 2nd number: 4 10/20
72/2 + 90/20 is 81/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 2 × 10 = 20,
72/2 = 72 × 10/2 × 10 = 720/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
90/20 = 90 × 1/20 × 1 = 90/20 - Add the two like fractions:
720/20 + 90/20 = 720 + 90/20 = 810/20 - 810/20 simplified gives 81/2
- So, 72/2 + 90/20 = 81/2
In mixed form: 401/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/4+90/20 72/2+90/40 72/6+90/20 72/2+90/60 72/10+90/20 72/14+90/20