Add 5/40 and 15/42
5/40 + 15/42 is 27/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
5/40 = 5 × 21/40 × 21 = 105/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
15/42 = 15 × 20/42 × 20 = 300/840 - Add the two like fractions:
105/840 + 300/840 = 105 + 300/840 = 405/840 - 405/840 simplified gives 27/56
- So, 5/40 + 15/42 = 27/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/40+15/42 5/40+30/42 5/80+15/42 5/40+15/84 15/40+15/42 5/40+45/42 25/40+15/42 5/40+75/42 35/40+15/42