Add 10/21 and 84/80
1st number: 10/21, 2nd number: 1 4/80
10/21 + 84/80 is 641/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
10/21 = 10 × 80/21 × 80 = 800/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
84/80 = 84 × 21/80 × 21 = 1764/1680 - Add the two like fractions:
800/1680 + 1764/1680 = 800 + 1764/1680 = 2564/1680 - 2564/1680 simplified gives 641/420
- So, 10/21 + 84/80 = 641/420
In mixed form: 1221/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+84/80 10/42+84/80 30/21+84/80 10/63+84/80 50/21+84/80 70/21+84/80