Add 21/36 and 12/20
21/36 + 12/20 is 71/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 36 × 5 = 180,
21/36 = 21 × 5/36 × 5 = 105/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
12/20 = 12 × 9/20 × 9 = 108/180 - Add the two like fractions:
105/180 + 108/180 = 105 + 108/180 = 213/180 - 213/180 simplified gives 71/60
- So, 21/36 + 12/20 = 71/60
In mixed form: 111/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36+12/20 21/36+24/20 21/72+12/20 21/36+12/40 63/36+12/20 21/36+36/20 21/36+12/60 21/36+60/20 21/36+84/20