Add 20/28 and 9/30
20/28 + 9/30 is 71/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
20/28 = 20 × 15/28 × 15 = 300/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
9/30 = 9 × 14/30 × 14 = 126/420 - Add the two like fractions:
300/420 + 126/420 = 300 + 126/420 = 426/420 - 426/420 simplified gives 71/70
- So, 20/28 + 9/30 = 71/70
In mixed form: 11/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28+9/30 20/28+18/30 20/56+9/30 20/28+9/60 60/28+9/30 20/28+27/30 20/84+9/30 20/28+9/90 20/28+45/30 20/28+63/30