Add 21/12 and 90/8
1st number: 1 9/12, 2nd number: 11 2/8
21/12 + 90/8 is 13/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 8 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 12 × 2 = 24,
21/12 = 21 × 2/12 × 2 = 42/24 - Likewise, for the 2nd fraction, since 8 × 3 = 24,
90/8 = 90 × 3/8 × 3 = 270/24 - Add the two like fractions:
42/24 + 270/24 = 42 + 270/24 = 312/24 - 312/24 simplified gives 13/1
- So, 21/12 + 90/8 = 13/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+90/8 21/24+90/8 21/12+90/16 63/12+90/8 21/36+90/8 21/12+90/24 21/60+90/8 21/12+90/40 21/84+90/8 21/12+90/56