Add 90/12 and 21/30
1st number: 7 6/12, 2nd number: 21/30
90/12 + 21/30 is 41/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
90/12 = 90 × 5/12 × 5 = 450/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
21/30 = 21 × 2/30 × 2 = 42/60 - Add the two like fractions:
450/60 + 42/60 = 450 + 42/60 = 492/60 - 492/60 simplified gives 41/5
- So, 90/12 + 21/30 = 41/5
In mixed form: 81/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+42/30 90/24+21/30 90/12+21/60 90/12+63/30 90/36+21/30 90/12+21/90 90/60+21/30 90/84+21/30