Add 10/5 and 21/42
1st number: 2 0/5, 2nd number: 21/42
10/5 + 21/42 is 5/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 5 × 42 = 210,
10/5 = 10 × 42/5 × 42 = 420/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Add the two like fractions:
420/210 + 105/210 = 420 + 105/210 = 525/210 - 525/210 simplified gives 5/2
- So, 10/5 + 21/42 = 5/2
In mixed form: 21/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/5+21/42 10/5+21/84 30/5+21/42 10/5+63/42 10/15+21/42 50/5+21/42 10/25+21/42 70/5+21/42 10/35+21/42