Add 10/20 and 42/80
10/20 + 42/80 is 41/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 20 × 4 = 80,
10/20 = 10 × 4/20 × 4 = 40/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
42/80 = 42 × 1/80 × 1 = 42/80 - Add the two like fractions:
40/80 + 42/80 = 40 + 42/80 = 82/80 - 82/80 simplified gives 41/40
- So, 10/20 + 42/80 = 41/40
In mixed form: 11/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20+84/80 10/40+42/80 30/20+42/80 10/60+42/80 50/20+42/80 70/20+42/80