Add 18/30 and 40/28
1st number: 18/30, 2nd number: 1 12/28
18/30 + 40/28 is 71/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 30 × 14 = 420,
18/30 = 18 × 14/30 × 14 = 252/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
40/28 = 40 × 15/28 × 15 = 600/420 - Add the two like fractions:
252/420 + 600/420 = 252 + 600/420 = 852/420 - 852/420 simplified gives 71/35
- So, 18/30 + 40/28 = 71/35
In mixed form: 21/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/30+40/28 18/30+80/28 18/60+40/28 18/30+40/56 54/30+40/28 18/90+40/28 18/30+40/84 90/30+40/28