Add 54/21 and 4/28
1st number: 2 12/21, 2nd number: 4/28
54/21 + 4/28 is 19/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
54/21 = 54 × 4/21 × 4 = 216/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
4/28 = 4 × 3/28 × 3 = 12/84 - Add the two like fractions:
216/84 + 12/84 = 216 + 12/84 = 228/84 - 228/84 simplified gives 19/7
- So, 54/21 + 4/28 = 19/7
In mixed form: 25/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+8/28 54/42+4/28 54/21+4/56 54/21+12/28 54/63+4/28 54/21+4/84 54/21+20/28