Add 81/84 and 1/5
81/84 + 1/5 is 163/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 5 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
81/84 = 81 × 5/84 × 5 = 405/420 - Likewise, for the 2nd fraction, since 5 × 84 = 420,
1/5 = 1 × 84/5 × 84 = 84/420 - Add the two like fractions:
405/420 + 84/420 = 405 + 84/420 = 489/420 - 489/420 simplified gives 163/140
- So, 81/84 + 1/5 = 163/140
In mixed form: 123/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84+2/5 81/84+1/10 81/84+3/5 81/84+1/15 81/84+1/25 81/84+7/5 81/84+1/35