Add 30/28 and 4/21
1st number: 1 2/28, 2nd number: 4/21
30/28 + 4/21 is 53/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
30/28 = 30 × 3/28 × 3 = 90/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
4/21 = 4 × 4/21 × 4 = 16/84 - Add the two like fractions:
90/84 + 16/84 = 90 + 16/84 = 106/84 - 106/84 simplified gives 53/42
- So, 30/28 + 4/21 = 53/42
In mixed form: 111/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/28+4/21 30/28+8/21 30/56+4/21 30/28+4/42 90/28+4/21 30/28+12/21 30/84+4/21 30/28+4/63 30/28+20/21 30/28+28/21