Add 81/80 and 25/84
1st number: 1 1/80, 2nd number: 25/84
81/80 + 25/84 is 2201/1680.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 84 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
81/80 = 81 × 21/80 × 21 = 1701/1680 - Likewise, for the 2nd fraction, since 84 × 20 = 1680,
25/84 = 25 × 20/84 × 20 = 500/1680 - Add the two like fractions:
1701/1680 + 500/1680 = 1701 + 500/1680 = 2201/1680 - So, 81/80 + 25/84 = 2201/1680
In mixed form: 1521/1680
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/80+50/84 81/80+75/84