Add 21/84 and 54/35
1st number: 21/84, 2nd number: 1 19/35
21/84 + 54/35 is 251/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 35 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420 - Likewise, for the 2nd fraction, since 35 × 12 = 420,
54/35 = 54 × 12/35 × 12 = 648/420 - Add the two like fractions:
105/420 + 648/420 = 105 + 648/420 = 753/420 - 753/420 simplified gives 251/140
- So, 21/84 + 54/35 = 251/140
In mixed form: 1111/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+54/35 21/84+54/70 63/84+54/35