Add 21/5 and 3/42
1st number: 4 1/5, 2nd number: 3/42
21/5 + 3/42 is 299/70.
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,
21/5 = 21 × 42/5 × 42 = 882/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
3/42 = 3 × 5/42 × 5 = 15/210 - Add the two like fractions:
882/210 + 15/210 = 882 + 15/210 = 897/210 - 897/210 simplified gives 299/70
- So, 21/5 + 3/42 = 299/70
In mixed form: 419/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+3/42 21/5+6/42 21/10+3/42 21/5+3/84 63/5+3/42 21/5+9/42 21/15+3/42 21/5+15/42 21/25+3/42 21/5+21/42 21/35+3/42