Add 20/36 and 16/21
20/36 + 16/21 is 83/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
20/36 = 20 × 7/36 × 7 = 140/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
16/21 = 16 × 12/21 × 12 = 192/252 - Add the two like fractions:
140/252 + 192/252 = 140 + 192/252 = 332/252 - 332/252 simplified gives 83/63
- So, 20/36 + 16/21 = 83/63
In mixed form: 120/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/36+16/21 20/36+32/21 20/72+16/21 20/36+16/42 60/36+16/21 20/36+48/21 20/36+16/63 20/36+80/21