Add 42/30 and 72/28
1st number: 1 12/30, 2nd number: 2 16/28
42/30 + 72/28 is 139/35.
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,
42/30 = 42 × 14/30 × 14 = 588/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
72/28 = 72 × 15/28 × 15 = 1080/420 - Add the two like fractions:
588/420 + 1080/420 = 588 + 1080/420 = 1668/420 - 1668/420 simplified gives 139/35
- So, 42/30 + 72/28 = 139/35
In mixed form: 334/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30+72/28 42/60+72/28 42/30+72/56 42/90+72/28 42/30+72/84