Add 21/2 and 42/84
1st number: 10 1/2, 2nd number: 42/84
21/2 + 42/84 is 11/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 2 × 42 = 84,
21/2 = 21 × 42/2 × 42 = 882/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
42/84 = 42 × 1/84 × 1 = 42/84 - Add the two like fractions:
882/84 + 42/84 = 882 + 42/84 = 924/84 - 924/84 simplified gives 11/1
- So, 21/2 + 42/84 = 11/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+42/84 21/4+42/84 63/2+42/84 21/6+42/84 21/10+42/84 21/14+42/84