Add 20/10 and 21/84
1st number: 2 0/10, 2nd number: 21/84
20/10 + 21/84 is 9/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 10 × 42 = 420,
20/10 = 20 × 42/10 × 42 = 840/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420 - Add the two like fractions:
840/420 + 105/420 = 840 + 105/420 = 945/420 - 945/420 simplified gives 9/4
- So, 20/10 + 21/84 = 9/4
In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/10+21/84 20/10+42/84 60/10+21/84 20/10+63/84 20/30+21/84 20/50+21/84 20/70+21/84