Add 20/42 and 45/28
1st number: 20/42, 2nd number: 1 17/28
20/42 + 45/28 is 25/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
20/42 = 20 × 2/42 × 2 = 40/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
45/28 = 45 × 3/28 × 3 = 135/84 - Add the two like fractions:
40/84 + 135/84 = 40 + 135/84 = 175/84 - 175/84 simplified gives 25/12
- So, 20/42 + 45/28 = 25/12
In mixed form: 21/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+45/28 20/42+90/28 20/84+45/28 20/42+45/56 60/42+45/28 20/42+45/84