Add 20/5 and 12/42
1st number: 4 0/5, 2nd number: 12/42
20/5 + 12/42 is 30/7.
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,
20/5 = 20 × 42/5 × 42 = 840/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
12/42 = 12 × 5/42 × 5 = 60/210 - Add the two like fractions:
840/210 + 60/210 = 840 + 60/210 = 900/210 - 900/210 simplified gives 30/7
- So, 20/5 + 12/42 = 30/7
In mixed form: 42/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/5+12/42 20/5+24/42 20/10+12/42 20/5+12/84 60/5+12/42 20/5+36/42 20/15+12/42 20/5+60/42 20/25+12/42 20/5+84/42 20/35+12/42