Add 20/28 and 70/12
1st number: 20/28, 2nd number: 5 10/12
20/28 + 70/12 is 275/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
20/28 = 20 × 3/28 × 3 = 60/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
70/12 = 70 × 7/12 × 7 = 490/84 - Add the two like fractions:
60/84 + 490/84 = 60 + 490/84 = 550/84 - 550/84 simplified gives 275/42
- So, 20/28 + 70/12 = 275/42
In mixed form: 623/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28+70/12 20/56+70/12 20/28+70/24 60/28+70/12 20/84+70/12 20/28+70/36 20/28+70/60 20/28+70/84