Add 10/42 and 20/80
10/42 + 20/80 is 41/84.
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,
20/80 = 20 × 21/80 × 21 = 420/1680 - Add the two like fractions:
400/1680 + 420/1680 = 400 + 420/1680 = 820/1680 - 820/1680 simplified gives 41/84
- So, 10/42 + 20/80 = 41/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42+20/80 10/42+40/80 10/84+20/80 30/42+20/80 10/42+60/80 50/42+20/80 70/42+20/80