Add 10/42 and 28/80
10/42 + 28/80 is 247/420.
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,
10/42 = 10 × 40/42 × 40 = 400/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
28/80 = 28 × 21/80 × 21 = 588/1680 - Add the two like fractions:
400/1680 + 588/1680 = 400 + 588/1680 = 988/1680 - 988/1680 simplified gives 247/420
- So, 10/42 + 28/80 = 247/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42+28/80 10/42+56/80 10/84+28/80 30/42+28/80 10/42+84/80 50/42+28/80 70/42+28/80