Add 21/14 and 54/84
1st number: 1 7/14, 2nd number: 54/84
21/14 + 54/84 is 15/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 14 × 6 = 84,
21/14 = 21 × 6/14 × 6 = 126/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
54/84 = 54 × 1/84 × 1 = 54/84 - Add the two like fractions:
126/84 + 54/84 = 126 + 54/84 = 180/84 - 180/84 simplified gives 15/7
- So, 21/14 + 54/84 = 15/7
In mixed form: 21/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/14+54/84 21/28+54/84 63/14+54/84 21/42+54/84 21/70+54/84 21/98+54/84