Add 3/84 and 54/15
1st number: 3/84, 2nd number: 3 9/15
3/84 + 54/15 is 509/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
3/84 = 3 × 5/84 × 5 = 15/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
54/15 = 54 × 28/15 × 28 = 1512/420 - Add the two like fractions:
15/420 + 1512/420 = 15 + 1512/420 = 1527/420 - 1527/420 simplified gives 509/140
- So, 3/84 + 54/15 = 509/140
In mixed form: 389/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/84+54/15 3/84+54/30 9/84+54/15 3/84+54/45 15/84+54/15 3/84+54/75 21/84+54/15