Add 15/42 and 10/80
15/42 + 10/80 is 27/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
15/42 = 15 × 40/42 × 40 = 600/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
10/80 = 10 × 21/80 × 21 = 210/1680 - Add the two like fractions:
600/1680 + 210/1680 = 600 + 210/1680 = 810/1680 - 810/1680 simplified gives 27/56
- So, 15/42 + 10/80 = 27/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42+10/80 15/42+20/80 15/84+10/80 45/42+10/80 15/42+30/80 75/42+10/80 15/42+50/80 15/42+70/80