Add 21/5 and 12/42
1st number: 4 1/5, 2nd number: 12/42
21/5 + 12/42 is 157/35.
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,
12/42 = 12 × 5/42 × 5 = 60/210 - Add the two like fractions:
882/210 + 60/210 = 882 + 60/210 = 942/210 - 942/210 simplified gives 157/35
- So, 21/5 + 12/42 = 157/35
In mixed form: 417/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+12/42 21/5+24/42 21/10+12/42 21/5+12/84 63/5+12/42 21/5+36/42 21/15+12/42 21/5+60/42 21/25+12/42 21/5+84/42 21/35+12/42