Add 1/20 and 3/42
1/20 + 3/42 is 17/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
1/20 = 1 × 21/20 × 21 = 21/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
3/42 = 3 × 10/42 × 10 = 30/420 - Add the two like fractions:
21/420 + 30/420 = 21 + 30/420 = 51/420 - 51/420 simplified gives 17/140
- So, 1/20 + 3/42 = 17/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/20+3/42 1/20+6/42 1/40+3/42 1/20+3/84 3/20+3/42 1/20+9/42 1/60+3/42 5/20+3/42 1/20+15/42 7/20+3/42 1/20+21/42