Add 81/21 and 20/32
1st number: 3 18/21, 2nd number: 20/32
81/21 + 20/32 is 251/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 32 is 672
Next, find the equivalent fraction of both fractional numbers with denominator 672 - For the 1st fraction, since 21 × 32 = 672,
81/21 = 81 × 32/21 × 32 = 2592/672 - Likewise, for the 2nd fraction, since 32 × 21 = 672,
20/32 = 20 × 21/32 × 21 = 420/672 - Add the two like fractions:
2592/672 + 420/672 = 2592 + 420/672 = 3012/672 - 3012/672 simplified gives 251/56
- So, 81/21 + 20/32 = 251/56
In mixed form: 427/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21+40/32 81/42+20/32 81/21+20/64 81/21+60/32 81/63+20/32 81/21+20/96