Add 1/5 and 42/45
1/5 + 42/45 is 17/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 45 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 5 × 9 = 45,
1/5 = 1 × 9/5 × 9 = 9/45 - Likewise, for the 2nd fraction, since 45 × 1 = 45,
42/45 = 42 × 1/45 × 1 = 42/45 - Add the two like fractions:
9/45 + 42/45 = 9 + 42/45 = 51/45 - 51/45 simplified gives 17/15
- So, 1/5 + 42/45 = 17/15
In mixed form: 12/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5+42/45 1/5+84/45 1/10+42/45 1/5+42/90 3/5+42/45 1/15+42/45 1/25+42/45 7/5+42/45 1/35+42/45