Add 21/7 and 32/20
1st number: 3 0/7, 2nd number: 1 12/20
21/7 + 32/20 is 23/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 7 × 20 = 140,
21/7 = 21 × 20/7 × 20 = 420/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
32/20 = 32 × 7/20 × 7 = 224/140 - Add the two like fractions:
420/140 + 224/140 = 420 + 224/140 = 644/140 - 644/140 simplified gives 23/5
- So, 21/7 + 32/20 = 23/5
In mixed form: 43/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+32/20 21/7+64/20 21/14+32/20 21/7+32/40 63/7+32/20 21/7+96/20 21/7+32/60 21/35+32/20 21/49+32/20