Add 21/20 and 1/84
1st number: 1 1/20, 2nd number: 1/84
21/20 + 1/84 is 223/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
21/20 = 21 × 21/20 × 21 = 441/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
1/84 = 1 × 5/84 × 5 = 5/420 - Add the two like fractions:
441/420 + 5/420 = 441 + 5/420 = 446/420 - 446/420 simplified gives 223/210
- So, 21/20 + 1/84 = 223/210
In mixed form: 113/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+1/84 21/20+2/84 21/40+1/84 63/20+1/84 21/20+3/84 21/60+1/84 21/20+5/84 21/20+7/84