Add 3/5 and 18/40
3/5 + 18/40 is 21/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
3/5 = 3 × 8/5 × 8 = 24/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
18/40 = 18 × 1/40 × 1 = 18/40 - Add the two like fractions:
24/40 + 18/40 = 24 + 18/40 = 42/40 - 42/40 simplified gives 21/20
- So, 3/5 + 18/40 = 21/20
In mixed form: 11/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/5+18/40 3/5+36/40 3/10+18/40 3/5+18/80 9/5+18/40 3/5+54/40 3/15+18/40 15/5+18/40 3/5+90/40 3/25+18/40 21/5+18/40 3/35+18/40