Add 20/5 and 63/21
1st number: 4 0/5, 2nd number: 3 0/21
20/5 + 63/21 is 7/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
20/5 = 20 × 21/5 × 21 = 420/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
63/21 = 63 × 5/21 × 5 = 315/105 - Add the two like fractions:
420/105 + 315/105 = 420 + 315/105 = 735/105 - 735/105 simplified gives 7/1
- So, 20/5 + 63/21 = 7/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/5+63/21 20/10+63/21 20/5+63/42 60/5+63/21 20/15+63/21 20/25+63/21 20/35+63/21